Just wanted to mention that you can walk straight through the "closed" gates at the end of the Thunderhead Keep Mission. While this might not sound too powerful it makes the mission a lot easier as you can intercept Mursaat before they reach the fort... even before the whole siege thingie starts.
A Ranger can go on and simply trap the mursaat spawnpoint (that cave and the gate) and the mission becomes as easy as pie.
Most of the Mursaat Army however will spawn when you init the siege. But it's still useful.
And just to mention it, there are two high loot chests out there too for all you farmers ;D






