Act 1: C5 - Roadblocks
Some ammo up ahead, then enter the building on the left. Ammo behind the counter and then go up stairs for a paper and more stuff. Come back down and move into the next room and to the right and outside will come about six Tickers. You could use the shotgun, but I say use your Hammershot or Lancer for more bullets. When you step outside the doorway, should have two more attack from both sides. Ammo in the corner of the room and around the wall.
Move down the alley where there is a Lancer if you swapped out yours; did I mention you have a shotgun? You could swap that out too if you don't like close combat. Break the barrier and then you can take cover behind the sand bags, or fire at the tickers like normal, but from the sandbags you could blindfire with success; blind fire is pressing fire without aiming while behind cover. Then grab the ammo and move on.
*NOTE: Blind fire in combat can help when you don't want to stick your head out and you want to fire and nearby enemies. The close the enemies, the better the chance your blind firing will be effective. From a distance blind fire is just a scare tactic.*
Go around the right corner for an inscription and some frags. When you move up the hill, there will be a ton of Nemacysts above you. Feel free to start blowing them out of the sky, but soon a Troika gunner appears atop a roof, so take cover. When all the mortars are gone, though others will keep coming, advance up the cover to get close to the gunner, then take him out. But there are more enemies in front of the gas station (Imulsion station to be more accurate). Take them out and then just stay behind cover from the second gunner on your left as some buddies will assit you. You remember Cole, right?
At the back of the station is a paper. There's also a Boltok behind the barrier to the right of the station, in the snow. Jump over the opening and head into the tunnel.
It seems that the Tickers keep coming, so just keep moving up and if you see any sign of movement in the darkness, fire. Ammo as you start, and be sure to keep an eye to your left if aiming to the right because chances are no one will see the ones on the left coming. Keep moving and once you hit the spot with some doorways on the left, take the first one for a COG Tag in a tiny room.
*NOTE: For any close attack, but especially if a Ticker gets close, you can press A while holding back or to the side to leap away from harm. You can leap forward, but I fail to see the purpose of lunging forward to avoid danger.*
Go through the main room, hitting the two Tickers that come out the hole, and then get back in the tunnel; ammo behind the car. Remember, move up slowly so the rig can follow and at least keep the light on you. Just two more spots of Tickers, then you should be able to run for daylight. A Reaver will of course spoil your exit, so take cover and shoot its mounts and then aim for the head; a few grenades may speed this up.
When you move forward you must choose between the rooftops or buildings. For now, let's go with the rooftops on the right. You can help your friends on the left if you want, but when you get around the corner you will take cover and handle the two on your side; blind fire helps, or run up and slice one up. Take the ladder around the corner and kill the mortar dude up here.
Grab it and firing it is tricky. You place it down with LT, and fire with RT, but to change the distance you fire you'll need to hold down RT as the "bar" on the cursor goes up - the farther up it goes, the farther the mortar travels. After each shot the bar will keep an outline of where you had it last so you can gauge where the next shot needs to go. When you grab the mortar, set it down, look over the street to the blocked door, aim the cursor over the door, hold down RT, and let go when it's about three away from the top. That should blast the door for them, then you can go down and help out.
*NOTE: You can keep that one with lots of ammo for the duration, you don't need to toss it or anything, it will be down the ladder if you jump down.*
When that is over, go to the blocked door by the ladder and your droid opens it. Run through and take out the two Drones here. Pick up the mortar and take cover behind a sandbag barrier, but from the left as a Brumak comes from the tunnel to the right. Should be about the same distance as the door shot, and he's stationary, so you're three shots should be enough, and you only need one good hit to take him out.