Turning the Tide Diablo III Guide
Last update: 11 May 2016
Speak with Sergeant Dalen to begin this quest. He will open a door leading to the next location of the stronghold.
Catapults raised in Stonefort (3)
Start exploring the Stonefort. This is another large location which features exploration of the stronghold's defense walls.
You'll be encountering mostly the same monsters as in previous quest. Follow the path until you locate the first catapult. It's worth knowing that in order to continue this quest you may be required to complete an event called Waiting for Reinforcements (it's described in the chapter about events of Act 3).
Talk to the soldier standing close to the first catapult and you'll find out that you must protect the recruits while they set it up. This is a part of another side event, called Raising Recruits. Wait until the catapult is ready before moving on.
Continue moving forward until you've reached the second catapult. Once again, you will have to protect your allies. This is achieved as a part of an event called Protect and Serve and it's going to be much harder this time to win.
Once again you must resume exploring the stronghold's walls. Locate the final third catapult. In this case you'll have to ready the catapult by working in co-operation with a lieutenant. It's achieved by interacting with a winch and fending off monsters at the same time and it's a part of an event called Manual Override.
Return to the Bastion's Keep Stronghold
Use a town portal spell to return to the Bastion's Keep Stronghold and to finish this quest.