Sentinel Hill is a People's Militia outpost in Westfall and their last stronghold in the region. It is here that the men and women of the People's Militia make their final stand against the Defias Brotherhood in a desperate last attempt to reclaim their homes. Its current population is around 300.
Most human characters visit during their adventures sometime after level 10. Sentinel Hill is located southwest of Stormwind and has only a few vendors. You can also find the Defias Traitor at the Sentinel Tower.
It has a flight path (gryphon roost), barracks-like inn, mailbox, and forge and anvil next to the lumber mill down the hill from Sentinel Tower. It is in this area where you receive missions for the Deadmines, and for those doing quests in Raven Hill Cemetery it is actually closer than traveling from Darkshire.
Raids on Sentinel Hill with the goal to kill Gryan Stoutmantle are common, mostly to provoke a response from nearby Stormwind City and draw Alliance players away in preparations for attacks on the city. In addition, the farm just to the right of the road from Sentinel Tower seems to be a popular spot for gold farming; lower-level gold farmers are often seen remaining in that small area, killing the same boars and vultures over and over.
There is a graveyard just outside of Sentinel Hill. Blizzard refers to it as a "default graveyard"[1][2] and so it will be your spawn point if you cannot spawn anywhere else (for example, if your 10-day trial of Burning Crusade expires, yet you are still in Outland and your hearthstone is bound to Shattrath City).
Contents
Flight Paths
Booty Bay, Cape of Stranglethorn
Furlbrow's Pumpkin Farm, Westfall
Moonbrook, Westfall
Raven Hill, Duskwood
Darkshire, Duskwood
Rebel Camp, Northern Stranglethorn
Stormwind City, Elwynn Forest
Lakeshire, Redridge Mountains
Sentinel Hill NPCs
The Defias Traitor
Thor - <Gryphon Master>
Kirk Maxwell - <Stable Master>
Innkeeper Heather - <Innkeeper>
Westfall Woodworker
Lumberjack
The People's Militia
Gryan Stoutmantle - <The People's Militia>
Captain Danuvin - <The People's Militia>
Protector Dutfield - <The People's Militia>
Protector Weaver - <The People's Militia>
Protector Bialon - <The People's Militia>
Protector Leick - <The People's Militia>
Protector Deni - <The People's Militia>
Protector Gariel - <The People's Militia>
Scout Galiaan - The People's Militia>
Scout Riell - <The People's Militia>
Protector of the People - <The People's Militia>
Vendors
Quartermaster Lewis - <Quartermaster>
Mike Miller - <Bread Merchant>
William MacGregor - <Bowyer>
Christopher Hewen - <Trade Supplies>
Gina MacGregor - <Trade Supplies>

Sentinel Hill in Patch 4.0.3, with the Raging Chasm in the background

The Raging Chasm as seen from inside the walls of Sentinel Hill
In Cataclysm
In World of Warcraft: Cataclysm, Sentinel Hill will be reinforced with stone walls and new towers. It will be almost completely enclosed, and the inn will finally have its roof repaired.[1]
Later on in the main Westfall questline Vanessa VanCleef reforms the Defias Brotherhood, as a part of their resurgence Sentinel Hill is attacked by the Defias, along with many recently converted homeless.
Inspiration
This could possibly be a reference to the Sentinel Hill in H.P. Lovecraft's story "The Dunwich Horror".
Patch changes
Patch 1.3.0 (07-Mar-2005): The stove at Sentinel Hill in Westfall can be used for cooking.
Media
Video
WoW Pro Lore Episode 38 - The Defias Brotherhood
The Defias Brotherhood and Sentinel Hill