Operation: Firestorm | Walkthrough The Bureau Guide
Last update: 11 May 2016
When you begin the mission, enter the gas station and pick up whatever weapons suit you, you'll find a whole arsenal there. Then listen to the Recording from the counter. You can also take a look at the back, where you'll see something interesting.
Then, you can move on. When you get to the burning truck, walk it round from right and head for the big shed. If you make it quick enough, you'll surprise Shield Commander and four Sectoids. Lift and eliminate the first one and then deal with the remaining aliens. In the second wave you'll have to eliminate few more Sectoids while in the last one: several Outsiders, two Drones and a Muton. Luckily, during this fight you can easily resupply your conventional ammo, there is a plenty of ammo packs nearby. If you haven't got Heavy Plasma Pistol yet, you'll find few of them at dead aliens bodies.
Move on and infect alien machine. Before the enemies arrive make sure that you have enough ammo. If you don't, there are several laser ammo boxes on right and left side of location like also at the very device. Then, prepare for a strong attack: you'll see several Outsiders, supported by their Elite leaders and a single Elite Muton. First of all, eliminate the weaker enemies (what decreases a danger) and then take care of the miniboss. The best way to kill him is to summon allies, change position and fire constantly at him.
After killing them and a short conversation with Barnes, approach the landing side, turn off the barrier and go into the forest. When you get to the house at the lake, approach the car and listen to the Recording on it. You can also use Resupply Station, which is under the street lamp.
Move on and prepare for a long battle. You'll see three Elite Phantoms and one Elite Sniper in front of you. Lift and eliminate the latter one, otherwise he'll decimate your squad. Then deal with the remaining enemies. For sure, they'll try to flank you what makes their moves predictable and easy to defeat.
When the first group is down, more aliens will appear, including several Elite Outsiders and another Elite Phantom. Kill the latter one, before you round and bite your squad. Then, prepare for the third wave of enemies containing of more Elite Outsiders and a Tech Commander. Kill the Tech as the first one, because otherwise he'll create a Turret which will be problematic. If you run out of ammo, you should find some additional conventional bullets in the house in the middle of location and on the right side of location (laser ammo).
Enter the bunker on the right side of the battlefield and pick up Rotary Plasma Cannon. This powerful weapon let you eliminate whole groups of enemies within a moment. It'll be very useful for you.
After that, enter the alien building and pick up a schematics of Anti-Personel Pack in the corridor - it increases damage dealt to enemies without an armor.
Leave the location and go forward. Finally, you get to the gas station, the same which you have left at the beginning of the mission. Go for the roof of building, using stairs on right and collect some ammo (a lot of it just around you). Then talk with Barnes by radio and prepare for a real siege.
In the forest in front of the gas station a Drop Pod will land with few first enemies: Outsiders and Elite Outsiders. When you begin eliminating them, another troop arrive, identical but additionally with dangerous Minion Commander (kill him or he'll summon more aliens!). Kill enemies carefully using Rotary Plasma Cannon and all useful abilities: it'll be a longer battle. If you run out of ammo, swap weapons and go to the ground floor, where you find more supplies (but all human, nothing alien).
When you eliminate two waves of enemies, the third one, coming from the breach, will appear. It contains several Outsiders with their Elite versions and a powerful Gunship. First of all, eliminate the weaker enemies, what decreases the danger and then take care of the boss. He has no chance against Rotary Cannon, especially when you go downstairs and you will move in and out of the building (plane's laser cannons cannot break the ceiling).
Defeating all enemies ends the mission.