Arrival at Zion

Arrival at Zion is a main quest in the Fallout: New Vegas add-on Honest Hearts.

Quick walkthrough

 * 1) Follow Jed Masterson.
 * 2) (Optional) Defeat the White Legs assault.
 * 3) Move into Zion Valley.
 * 4) Travel to the Dead Horses Camp at Eastern Virgin with or without  Follows-Chalk.
 * 5) Speak with the Burned Man.

Detailed walkthrough
Shortly after the completion of Happy Trails Expedition and the player's initial arrival in Zion, a group of White Legs will attack the caravan, killing everyone but the Courier. There is no way to save the caravan members, as their deaths are scripted. The ambushing White Legs may come equipped with powerful weaponry, including anti-materiel rifles, 12.7mm submachine guns, riot shotguns and brush guns at higher levels, and killing them is completely optional.

After crossing the bridge toward the rest of Zion proper, one more White Legs member will attack the player from a distance. The attacker will, in turn, be attacked by Follows-Chalk, a scout from the Dead Horses tribe who can join the Courier as a companion. The player can opt to let Follows-Chalk join immediately, or send him away. If Follows-Chalk joins the Courier, he will provide scripted commentary on the way to Dead Horses Camp.

If the player allows Follows-Chalk to join, he may point out a hollow log that contains random minor loot. Not far down the path toward Dead Horses Camp, a non-hostile giant yao guai will make a brief appearance in a scripted event. Further along the path, Follows-Chalk will note a cliff (the name of the cliff with a view, which is the first opportunity to make use of the Well-Stacked Cairns perk. When getting close to the Dead Horses' camp, Follows-Chalk will warn the player about traps set in the river to keep marauding White Legs at bay.

On arrival at Dead Horses Camp, the Courier is to enter Angel Cave and follow it until he finds Joshua Graham. Engaging in conversation with Graham will complete the quest.

The player can also opt to simply kill Follows-Chalk, which fails this quest and triggers Chaos in Zion. Triggering Chaos in Zion disallows participation in all other quests in the Honest Hearts add-on, so if the player wishes to experience all of the quests, care should be taken not to accidentally kill Follows-Chalk when crossing the bridge and dealing with the last ambushing White Legs member.

Bugs

 * If you interrupt the dialogue during the opening of this quest by going to the load menu, the dialogue can lock up before Stella can say her final lines to Jed--leaving you unable to move with the other caravan members just standing around, saying nothing.
 * One of the White Legs might become invincible if you leave the ambush without defeating them, thus making it impossible to complete the optional part of this quest.
 * When reaching the area where the yao guai attacks, the game will crash every time, making it impossible to go further.
 * During the ambush, the White Legs may become invisible until the combat is over.
 * Some White Legs may be non-hostile and too far away from the cliff to kill them, making the optional part of the quest impossible to complete.
 * Jed Mastersons' body will not disappear after his death during the White Legs assault.
 * Follows-Chalk may briefly appear as an enemy when attacking the White Legs. This can lead to the player accidentally killing him thus breaking the main quest. (Confirmed on Xbox 360. Seems to be related to bug 1 on this page on the 360)
 * On occasion, there may be one last White Leg to find and it might seem like he is invisible or stuck in the rock wall. Look up and you will see him on the high cliff above Jed's body.
 * When first entering the Northern Passage and physically moving Ricky to close to the exit, he will disappear. The other Caravaneers will still refer to him as if he were still there, and will cause a bug in the scripted event of your fellows being killed. After Stella shouts out she was once a sheriff, go to the end of the bridge, come back, and everyone will be dead and you can continue.