Caesar's Legion

''War. War never changes. The Romans waged war to gather slaves and wealth. [...]''

''What is your name? My name is Legion, for we are many.'' Marc 5:9

Overview
Comprised mostly of reconditioned tribals and their offspring, Caesar’s Legion is a huge and powerful slaving organization, that used to operate east of the Grand Canyon. Led by the charismatic and cunning “Caesar", the legionnaires are a well-organized fighting force and absolutely merciless in their slavery. It is truly brutal group, which not hesitate even to enslave or kill Mormons, despite most tribals and other organizations leave them alone, knowing that they often will voluntarily give medical or other aid [notice: Mormons live north of Colorado River and Grand Canyon, but they can travel].

Mimicking the ancient traditions of the Roman Empire, the legionnaires dress in segmented football pad armor and decorated football helmets [ notice ].

Caesar attempted to destroy the New California Republic (NCR) presence in the east, and actually succeeded in destroying one of their major fortifications, Fort Aradesh (located east of the Grand Canyon). When Caesar attempted to take Hoover Dam, the Legion was badly defeated. Since that time, Caesar has moved east of Texas, past the legendary cyclones that rage for most of the months of the year. Despite this, packs of his legionnaires still operate in the southwest, collecting tribute from tribes in the form of goods and slaves [notice: the only known tribe present in van Buren and paying this tribute are Blackfoot].

Relations with other organizations

 * hostile relationship with the NCR and its branch - the NCR Rangers, concerning probably slavery problems; the Followers of the Apocalypse are touchy about their connection with Caesar’s Legion - it is from their ranks that the original Caesar came (Followers are dedicated to reeducating and rebuilding the wasteland, they teach people valuable medical and agricultural knowledge, they are generally liberal thinkers who occasionally plant seditious thoughts in the heads of oppressed citizens),
 * hostile relationships with peaceful Mormons; Mormons are shamed also, because of the fact, that from their ranks came Joshua Graham, another notorious Caesar's Legion founder,
 * the Daughters of Hecate reserve a special hatred for Caesar’s Legion (notice: Caesar's Legion has destroyed Twisted Hair by tribals; it was Hecate's original tribe), because of it Legion should have hostile relationships with Vipers (van Buren: Hounds of Hecate) also,
 * relations with Hangdogs tribe are not described - in van Buren it is part of Blackfoot tribe, that is tributary to Caesar (most of the Blackfoots fear the power of Hecate and her Daughters, but unlike Caesar, they see being under the influence of Hecate as a necessary evil, since she's "proven" time and she controls the tribe's fertility); according to leaks Hangdogs were planned to be often in league with Hecate.
 * other tribes are probably neutral or are potential victims (eg. cut off from van Buren "Iron Lines" or absent in J.E. Sawyer's Fallout Role-Playing Game Jackals, Scaven Pickers, Ciphers and Twin Mothers - latter two were designed as victims).

Emblem
In J.E. Sawyer's Fallout Role-Playing Game (J.E. Sawyer's Fallout Wiki) Caesar's Legion standard was black bull (Venus'es symbol) on red backgroud and desciription "Legio X". It could be refference to Legio X Equestris, that fought for Gaius Julius Caesar in many of his major battles, and Caesar used its legionaries as bodyguards. Long merging-disbanding history includs bull emblemed legios X Veneria, Gemina or Fretensis.

van Buren pieces of development

 * "The first fringe of the slaver band, Caesar’s Legion" was planned to encounter and fight in the Circle Junction Train Yards (Chris Avellone's test pen-and-paper campaign).
 * The Daughters of Hecate and Caesar’s Legion was thought as the female and male polar opposites, which was supposed to allow the player, depending on gender, to rule either one and use them to build an army, Postman style (van Buren first vision).
 * Sharptooth, cut-off member of Hangdog tribe, was planned to be a spy for Caesar's Legion, reporting to their agents in Denver (only because Caesar holds Sharptooth's sister as a slave). If this becomes known, the other Hangdogs will demand that he and his family be banished to the wasteland. Bares-His-Teeth will have no qualms about doing this (Blackfoot design document). Before merging with Blackfoots Hangodgs tribe could be planned to live in northeastern Colorado, near Denver (J.E. Sawyer's Fallout Role-Playing Game).
 * The Prisoner, equipped with Fallout Tactics-like pump-action shotgun and some unknown grenades, together with his five CNPC party, could kill hostile pack consisted of Legion slaver and Legion vexillarius gaining 2545 xp (according to one of van Buren screenshots).

The Caesar's Legion concept authors: preproduction - Chris Avellone, then - J.E. Sawyer, B.A. in history.

Timeline

 * 2238 - mormon missionary Joshua Graham encounters in Grand Canyon two Followers of Apocalypse; one of them later will establish slavers Legion and become its Caesar,
 * between 2238 and 2241 - first tribute in slaves given Caesar by Blackfoot tribe,
 * after 2238 - tribes taught by growing in power Caesar's Legion helped it to exterminate powerful Twisted Hair tribe, merciles raiders and slavers,
 * 2249 - a lucrative slave trade is established between Caesar's Legion, Blackfoot tribe and ghouls in the Reservation; since that moment the Legion aquired wide access to weapons, ammunition and armors produced there (things start to fall apart in the NCR - Congress building destroyed, empty space at Hoover Dam timeline),
 * before 2251 the Legion tried to invade Hoover Dam, sometime earlier the Legion destroyed Fort Aradesh,
 * after failed attack on Hoover Dam, but before October 2253 - the Legion moves to the east.

War against the New California Republic

 * Fort Aradesh was far east the NCR outpost until the Legion totally destroyed everyone in it. It was the first major loss, that made governor Dodge fear Caesar and gave Caesar the confidence to push forward all the way to Hoover Dam.
 * Dodge still does not understand the motive for Caesar’s Legion attack (ideology, business and politics reasons are obvious, so probably there were no direct motive for attack).
 * The NCR had to cope with internal and external problems in the same time - internal problem was troubles in economy conected with halting production on the railroad lines in year 2245 and rising up the powder gangs, external problem was war against Brotherhood of Steel.

Ouroboros age inconsistency
It was founded by Hecate, but after Caesar's Legion was created (see: 2238 year), but:
 * Hecate was young woman, when her Twisted Hair tribe was destroyed,
 * she had spent several months in the Nursery, where was taught by Diana,
 * Jordon, captain of the Ouroboros elite city guard, is young unmaried man and was raised there since the age of three years.

October 2253
During the game the Legion presence finally was planned in:
 * Denver, as temporarily used transit camp for the slave transport on the way to the east; it seems, that Caesar's Legion official in Denver (vexillarius Terrence) was planned to be important Caesar's represenative on the southwest, known as Caesar's Legion agent,
 * the Reservation, where slaves are exchanged for weapons, ammunition and armors,
 * Fort Abandon - however in first vision it was planned to be the NCR rundown fort.

Legionaires packs presence in Denver and in the Reservation isn't permanent:
 * Denver is visited once a year,
 * the Reservation is visited once a month.

Accept one event there is no Legion members at Blackfoot village. Van Buren design documents don't describe encounters with hunting Legion slavers (meaninig of the accident seen on the van Buren screenshot - hostile Legion slaver and vexillarius - is not certain).

Both packs of Legionaires take slaves from somewhere on the southwest. Some of this slaves can be taken from Blackfoot tribe. Some - from freelance slavers. It seems there is no serious demand on slaves on the southwest. In fact only the Reservation is interested in some significant shipments. Blackfoots sell some slaves to another tribes also, but the only other known tribe dealing with slavery are Hecate's people. So significant part of caught slaves are exported once the year to the east, by Denver camp. It looks also that two packs of Legionaires, some freelance slavers and allied Blackfoot tribe is enough, or have to be enough, to secure Caesar's business on the southwest.

Caesar and accompanig him part of his Legion should have some base, abandoned while the Legion moved to the east. It could be located on Texas latitudes in northern Arizona or northern New Mexico. The Prisoner can't find it, so this empty place probably isn't significant (another less probable possibility - it was secret place).

The only the NCR military action against Caesar's Legion during van Buren game is take over of Fort Abandon. It was planned to do by the NCR army renegades accompaning dr. Presper. There is no information about any the NCR retaliation actions after failed attack on Hoover Dam.

Caesar's Legion genesis
The name of the new slaver organization was not only connected with fact, that Caesar's was mimicking ancient Rome. There are also some Bible tradition roots, given probably by ex-Mormon Joshua Graham. Many demons or evil spirits possessing some man named themselves the Legion [notice: (1) events descripted in the New Testament occured, when Palestine was subjugated to the Roman Empire, (2) slavers are evil].

Organizations, that gave some patterns for the Legion development:
 * Slavers' Guild - slavery as commercial activity,
 * Twisted Hair tribe - management of slaving and raiding tribe, its customs,
 * Followers of the Apocalypse - medical and agricultural knowledge, subversive thinking, military science, including roman army patterns,
 * Mormons - medical and preacher knowledge.

Factors of the ancient roman army success, probably admired by Caesar, were:
 * consistent motivation and cohesion.,
 * flexibility,
 * adaptation of good practices,
 * discipline, organization and systematization eg. in training, logistics, engineering or replacements system.

Caesar's Legion is comprised mostly of reconditioned tribals and their young offspring (the oldest childred born since the Legion has been created, can be 15 years old). High rate of offspring growth could be possible with use of Followes of the Apocalypse and Mormons medical and agricultural knowledge [notice: Hecate's medical and birth service is later]. Reconditioning was performed during hard competition with Twisted Hair tribe. It is possible, that during the war against Twisted Hair tribe the Legion founders and members adopted some violent customs and behavior of their enemy.

It is possible, that thanks to the reconditioning and slaver experience the Legion has more as tough officers and seasoned warriors as centurion Caius Drusus (experience level 14), however vexillarius Terrence is not described with such compliments. The reconditioning can be connected with promotion of some prejudices among Caesar's Legion members - legionaires in Denver asses people from the southwest as primitives and assholes.

Tribes in van Buren world are the largest organizations (eg. there are 300 Blackfoot tribals and about 100 Jackals and Hecate's people). To be assessed as huge the Legion should farly exceed this numbers.

Caesar's Legion organization
There is no information about Caesar's Legion structure and organization in van Buren sources. However it is significant, that Caesar created his slaving organization as "legion", a military organization, rather then an "empire", as state-like organization (it was possible to move Ceasar's Legion to the east, so its main resource are people).

Organization solutions partially should orginate from northern California slaver organizations experience. Caesar's Legion is powerfull and huge, but slaving job is the same as performed by Metzger's and Vortis'es tiny organizations. Especially Metzger used to have some personal guards (13) and cooperated with less liasoned Slavers' Guild members, hired to help with slave runs. Living in Shady Sands Vortis and his 7 slavers had to cope with the NCR Rangers.

There is almost no information about quasi-roman organization features, besides fact, that:
 * the Legion has at least one centurion, who commands detached small slaver pack,
 * similar function can perform Legion official of a vexillarius rank.

However both known Legion officials carry more responsible duties, then commanding small slavers packs only, because:
 * experienced slaver with centurion position could be necessary to take care of Caesar's busineses in the Reservation,
 * another official could be necessary to represent Caesar in northern areas as Caesar's agent in Denver.

Beacuse of slaver job nature Caesar's Legion shouldn't act as concetrated military power. Exeption could be war against the NCR.

Caesar's Legion packs in van Buren are comparable with: Caesar's Legion pack can be equivalent for contemporary squad, a small military unit led by a non-commissioned officer (seargant or corporal), that is subordinate to an infantry platoon. At least pack encountered in Denver is called like that. Caesar's Legion packs can be compared with ancient roman army contubernia also (see: discussion).
 * slaver packs encountered in northern California and Nevada by Chosen One,
 * tribal slaver packs encountered on the southwest by the Prisoner (Blackfoot and Hangdog).

Caesar's Legion ranks
The Prisoner can talk about them with Terrence. Known ranks are:
 * legionaire or soldier - simple slaver in Legion ranks,
 * vexillarius - in ancient roman army vexillifer was special duty post, unique to the legion; he was one of the signiferi (standard bearers); his duty was to carry the vexillum, a military standard displaying the name and emblem of the legion (in late antiquity it was common for a legion to detach some sub-units from the main camp to strengthen other corps; in these cases, the detached subunits carried only the vexillum, and not the aquila, and were called, therefore, vexillationes); Terrence is not a vexillum bearer, but slaver transport pack leader,
 * centurion - in ancient roman army mid-level officer, the backbone of the professional army, career soldier who ran the day to day life of the soldiers as well as issuing commands in the field; centurions were generally moved up from the ranks, but in some cases could be direct appointments from the Emperor or other higher ranking officials; comparing the centurion to modern military ranks is problematic, as the century falls somewhere between modern platoon size (30-40 soldiers), and modern company size (100-200 soldiers); in fact centurions covered a whole range of ranks; ordinary century commanders would be equivalent to a modern army lieutenants (a first or second) or captains - as platoon or company level units commanders; the senior centurions leading cohorts would be equivalent to lieutenant colonels; the Primus Pilus, leading doubled first cohort, with his senior staff role (advisor to the legatus legionis) might be considered equivalent to a modern colonel.

Possibly the Legion doesn't need to have separate commander (legatus legionis), because Caesar can command it personally. As Caesar's right hand man, Joshua Graham could be appointed as tribunus laticlavius for second in command position or as Primus Pilus.

Outside of Legion ranks are subjugated, allied tribes and freelance slavers, that cooperate with Legion (eg. non-Legion slavers in the Reservation, may be slavers, who captured Ciphers or Alexandra, the bounty hunter).

Caesar's Legion equipment
Caesar's Legion has access to firearems, ammunition, leather and metal armors produced by the Reservation. Probably even miniguns could be possible to acquire there, however ghouls use only two of them. The Reservation don't manufacture energy weapons. Caesar's Legion firepower can be assessed at the ruined eastern part of Hoover Dam.

The Legion packs equipment:
 * in the Reservation - because of radiation: heavy environmental suits, according to Reservation design document pictures - equivalent for Fallout Tactics environmental armor); as firearms: assault rifles or shotguns; Caius Drusus does carry a big .45 handgun - the exact model is unknown (see: discussion),
 * in Denver - good weapons, eg. Hunting Rifle (compare: Larsen's team in Boulder design document or powder gang equipment described in New Canaan design document) and probably some equivalent of leather armors.

Examples of equipment:
 * Shotguns, as a good weapons for reconditioned recently legionaires. This kind of weapon needs relatively low manufacturing technology level and it is possible to make it at outdorsman camp by tribals (eg. Blackfoot). Shotguns have quite good accuracy also - in Fallout 2 it works as +20% accuracy modifier, that is independent of weapon range and ammo stats. Such a accuracy modifier is connected with Shotgun, Sawed-Off Shotgun, Combat Shotgun and Pancor Jackhammer. Possible shotguns are:
 * "Fallout-like ordinary shotguns", present among van Buren demo sprites. Fallout 2 slaver master Metzger carried such shotgun also;
 * "Fallout Tactics-like pump-action shotguns", seen in van Buren screenshots. According to Burham Springs design document pump-action shotgun was planned to be present there - salvager Phil carries one.
 * Hunting Rifles, as a basic, but decent sniper weapons. In Fallout 2 world its feature is +40% accuracy modifier. Such rifles were used by slavers during slave raids from Den.
 * Assault Rifles are possible to purchase, because ghouls probably sold its to other slavers, and very likely to Hoover Dam and Maxon Bunker also (the NCR soldiers at Hoover Dam are desribed as armed with high powered rifles); there is no reason, that legionaires can't be equiped with such weapon.
 * May be Cattle Prods.
 * Some bondage equipment, eg. ropes.
 * Caesar's Legion has access to some chemical storage or technology, because legionaires in Denver use an anti-dog repellent.
 * Strange chariot concept art can be source of speculations concerning its use and its background (eg. other possible self propelled vehicles, presence of hipodrome at the Legion headquarter...).

The Legion music description
Caesar's Legion music description was melody evoking a Roman legions marching tune - it is musical background planned for its camp in Denver.

Denver affairs
The Legion pack encountered in Denver is responsible for transport of the slaves to the east, where the new Caesar's headquarter is located. Legion pack appears there once a year on their way back to Caesar. Every couple of weeks a pair of fast guys out east scout, if the radioactive dust storms have subsided for the season. Once they do, they'll head out.

This pack is led by vexillarius Terrence. Under his command are 5 generic legionaries - Cruz, Wierzbowski, Thunderfoot, Ivory and Marco. One of them can be a sniper (equipped probably at least with hunting rifle, as powder gangs snipers) and two of them are scouts (may be tribal background Thunderfoot is one of them). They are well armed, as far as wastelanders go.

If the Prisoner is in alliance with the Blackfoot tribe, he has in with the guys from Caesar's Legion. They mainly want to keep away from the "primitives and assholes" who live in this part of the continent. After an unsuccessful dialogue Terence and his slavers will attack the Prisoner.

Among the slaves the Prisoner can see Daniel, supermutant Blackjack and captured Ciphers (may be other anonymus Tibbets prisoners also). Blackjack was sold there by Alexandra, CNPC bounty hunter. The Reservation don't buy supremutant and ghoul slaves, so if there are any, they are transported to the east [notice: ghoul slaves don't appear in van Buren design documents].

Acting as Caesar's Legion agent Terrence purchases or gets:
 * Ciphers slaves,
 * Blackjack (this case includs punishment for Hangdogs also, because they promised to deliver him and didn't keep the promise),
 * information about gentle Twin Mothers tribe - for 1000 caps (according to demo text files; it is more likely also, because the Reservation is less accesible and not known to everybody; it is possible also, that both Terrence and Caius Drusus could receive this message),
 * informations from spy within Hangdog tribe (cut off event).

The legionnaires in Denver are camped out in a hotel in southern part of the town with some slaves they've rounded up. They have the lower floors secured with chain link fence and barriers made of junk. They keep the dogs away with chemical repellent sprayed in the area, resprayed every year when they return there. They're alert. They stay on the 2nd level, though they are watching their surroundings and might have a sniper hiding out on the ground floor. They keep the slaves locked in rooms on the 2nd and 3rd floor (there are 30 rooms).

The Prisoner have to deal some way with the Legion slavers, if he wants to repair klaxon station on the 2nd floor of the hotel, to drive all of the dogs out of the city.

It has never been a concerted slavage effort until the NCR slavagers arrived to Denver, however probably Caesar's Legion have made by slaves some basic salvage and builing works concerning its camp.

Trade with the Reservation
Experienced centurion Caius Drusus is in charge there. Members of Caesar’s Legions are the main suppliers of the slaves for the Reservation. There are other slave traders, but most slaves come from Caesar’s Legion. Caesar’s Legion enjoy trading human slaves for firearms, armors and ammo. Trade is luxurious, however the Reservation don't buy supermutant or ghoul slaves.

Caesar’s slave traders come once every month to sell slaves to Horatio. Should the Prisoner waste the Slaver Caravan in the Slaver Caravan random encounter, Caius and friends will never show up again to sell slaves. This will concern Horatio, but he will not lose sleep over it since there are other slavers in the wasteland (eg. ghoul slaver Ingmar).

Caesar's Legion needs ammunition such as: 12 ga, 5 mm, smaller amounts of .45 bullets and may be .223 FMJ.

Notice:
 * Slaver Caravan random encounter isn't unique and according to the Reservation design document this caravan can be destroyed more then one time. It isn't described as Caesar's Legion slaver caravan also.
 * It is not certain where the Legion weapons shipments go, if there are any (travel to the east is possible once a year only, there is no information concerning Caesar's Legion weapons caravans).
 * Delivered slave number estimations (if average long term slave workers number is two dozen; according to the Reservation monster roster c.a. 15 slaves can be encountered there, however it can be a faction):
 * 47 - 58 groups of slaves delivered by the Legion on constant monthly basis until October 2253 (47 or 58 - number of months since January or December 2249 to October 2253); unknown number of slaves per month, there can be some fresh slaves at the slave market,
 * since 2249 year ghouls have lost 47 - 58 slave workers (the Reservation average slave time of living 2 years multiplied by two dozen - rarely does a slave lives longer than a couple of years)
 * during 2 years after Belle was born the Reservation wasted ca. 13 slobs (slob waste rate 98%, for creation of 4 Born Ghouls between 2227 and 2251 year were used 200 slobs);
 * lost slave workers and slobs since 2249: 60 - 71, which can be contrary to over 50 monthly slaves shipments.

Some NPC liasoned to the Legion

 * The Twisted Hair tribe was one of the most domineering tribes in the wasteland. They regularly raided their neighbors for food, supplies, and slaves. They were merciless in their efforts and the other tribes began to fear even the mention of their name. It was during the reign of the Twisted Hairs that Caesar's Legion rose up. The Legion taught the tribes to fight back and the Twisted Hairs were soon driven from their lands. Weakened and on the retreat, the Twisted Hairs were then set upon by the Legion and destroyed. No one was spared, but one woman did manage to escape. Tribal "goddess" Hecate was the only survivor of this masacre. She lives in Ouroboros and rules female tribe and religiuos organization named Daughters of Hecate and male tribe and raider organization named Hounds of Hecate, (former Vipers). Hecate hates Caesar and would like to wipe out Caesars agents in the area. Her further plan is simple. When the tribes were weak enough, her Hounds would sweep down upon them and annihilate them from the face of the earth. The same would come to pass with Caesar and his Legion.
 * Slaving Blackfoot tribe - allied with Caesar. Within this tribe - Bares His Teeth, current packleader of the Hangdogs. He's an arrogant leader full of self-importance. He thinks himself a right-hand man of Caesar, and therefore very important in the wasteland. It was planned, that Hangdogs promised to deliver Blackjack to Caesar's Legion. Hangdogs would be hardly punished, if this promise was not fulfilled.
 * Joshua Graham, former mormon missionary, was involved in the rise of Caesar and became Caesar's right hand man, shaming the Mormons. After failed attack on Hoover Dam Caesar had him burned and thrown into Grand Canyon by tribals. It was planned, that just after escape from Tibbets the Prisoner meets Graham at Fort Abandon, hanged by the neck on a pole. Hanged Man wasn't finally planned to appear in van Buren.
 * Alexandra, CNPC bounty hunter, who hangs up in Fort Abandon and going to make business with the Legion in Denver. She has mormon origin also.
 * Anton, the leader of the non-NCR salvagers in Denver, is from the Midwest, home of the radioactive cyclones, and fled to Denver to escape Caesar's Legion.

Caesar, Hecate and tribals

 * For over a decade since year 2231 four Brotherhood of Steel paladins under Andrea Brixley's command had explored "the east" from Maxson Bunker and had forged relationships with many of the tribes that inhabited the area. Eg. senior scribe Isaac after desertion found his home among Ciphers.
 * Caesar's Legion, established after 2238 year, was comprised mostly of reconditioned tribals and their offspring.
 * Growing in power Caesar's Legion taught the tribes to fight back the Twisted Hair tribe. Hecate, the only Twisted Hair survivor, influences this tribes and is going to anihilate them.
 * Caesar had executed Joshua Graham by tribals. This tribals feared and hated Graham (according to New Canaan design document). Graham was feared by Blackfoots (according to Blackfoot design document). I seems particullary Blacktoots feared him.
 * Jackals have been moving east to the Boulder area because of pressure from the unified tribes, other tribes despise and fear them. Jackals are supported by a Daughter of Hecate called Crazy Bitch.
 * Other known tribes hosting Daughters of Hecate are Blackfoots with Hangdogs and Twin Mothers. Twin Mothers are not known to Caesar's Legion, they weren't a member of anti-Twisted Hair league and they wouldn't harm Hecate. Ciphers and "Iron Lines" refused Hecates care and because of it they are in conflict with Hecate's people. "Iron Lines" have remained largely immune to the plagues that haunt other tribes, who go against Hecate’s wishes.
 * The only known tribe on the southwest allied with Caesar are Blackfoots. However they are supported by Hecate also.
 * Blackfoots sell slaves to other tribes and to the Reservation. The only other known slaving tribe in van Buren are Hecate's people (her Hounds aka Vipers). May be ghouls in the Reservation can be regarded as a some kind of "tribe", as Ailis McLafferty described her weapons supply source in Hoover Dam.

Possible explanations of contradiction:
 * Caesar took to the east his tribes also,
 * technically - tribes weren't implemented into van Buren or were cut off.

There is van Buren first vision plot also: the Daughters of Hecate and Caesar’s Legion was thought to use them to build an army with Ciphers, Hangdogs, Vipers and Jackals tribes.

The new location on the east


The east was the place, where the new Caesar's Legion location was placed. True power of Caesar's Legion could be seen there, described as huge, powerful, well-organized, absolutely merciless, truly brutal fighting force and slaving organization.


 * Caesar has moved east of Texas, past the legendary cyclones that rage for most of the months of the year.
 * The Legion pack encountered in Denver travells to the east, in Kansas direction, when the radioactive dust storms subside for the season.

The Midwestern United States (or Midwest) refers to the north-central states of the United States of America, specifically Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Ohio, Nebraska, North Dakota, South Dakota and Wisconsin. Tornados very often appear in the Southern United States also (see: at wikipedia.

It seems, that the Legion moved east of Texas and the Midwest.

Possible inconsistency: Anton is from the Midwest and fled to Denver to escape Caesar's Legion.

Appearances in games
The Legion was initially (when Chris Avellone still worked on the project) to play a significant role in van Buren (Black Isle's Fallout 3), but they were mostly cut out because the game was getting too big, although they had some minor appearances in the game, which don't affect endfilms. Black Isle planned to give them a major role to play in Fallout 4: "You wouldn't see their true power until a sequel" [notice: it is possible to whip out both Legion packs]. It is not certain if they will appear in any future Fallout game, however there is planned some slavers appearance at Bethesda's Fallout 3.

The Legion is present in J.E. Sawyer's Fallout Role-Playing Game also.