Mission 13: Throttle

When you first enter the mission area, head to the right. You'll see a green truck – that's your best friend for cover right now. Use it to take out the enemies on the bridge first. Once they're down, clear a path towards the upper right of the area. You'll need to run through an open trailer to get there and clear out more enemies.

Ammo crates are scattered all over this mission, so don't be shy about spamming your grenades to clear out groups of enemies. After you've pushed forward a bit, head left and get under the tent. There's another ammo crate there. You'll be directly under some turrets, so keep spamming those grenades until you've cleared a path upwards.

Things get a bit tougher when you need to regroup, as a bunch of ASTs (Armored Support Troopers) show up. Instead of trying to take them head-on like usual, get up to that turret and use it to shoot them down. There will be one last AST on the southern side that you can't hit from the turret. You'll have to fight your way back to it. This time, stick to the buildings on the right side for the best cover.

There's another ammo crate on this side, so you know the drill: spam your Smart Grenades until most of the enemies are dealt with. You'll spot the last AST on top of a building. To deal with it without too much trouble, get up there from the far left side. You can use your grapple, just like you did with enemies in Mission 8, to take it down.

Finally, when it's time to grab the Stinger, you'll need to Boost Slam to the ground to dodge all the incoming bullets.