Friendly Fire

Friendly Fire is the fifth chapter of Opposing Force, the first add-on pack of Half-Life. It details Adrian Shephard and other HECU soldier's attempt to find and use an old transit system to escape to the Lambda Core. It is also the chapter in which the Black Ops are first introduced.

Walkthrough
Previous Chapter: Missing In Action

Exit from the elevator into a reception area. Slaves will attack from all directions; try to keep your Engineer alive. Once they are dead lead the Engineer to the metal door opposite. At the far end of this room you will find an unlocked security cache with lots of goodies. Exit and lead your squad (or don't; they aren't important from this point on) up the stairs and through the door. Kill the slaves in the room to the right, go through the door opposite. Be ready for an Alien Grunt and another Slave to teleport in, there are even more in the room with the projector on the right. Go in here and approach the left wall, more aliens will attack through it. Go through the hole, turn left and then right.

Employee of the Month, eh? Climb into and then up the hole with the pipe to exit the office suite. You will reach a narrow metalled area; turn left and deal with two Grunts across the gap by firing on the explosive crates. It is difficult to avoid damage here. Jump onto the first dangling wire; wait for the electric bolt to dissipate then jump to the second wire, then very quickly jump to the walkway. Get the supplies then walk around to the lift. Listen to the radio in the next room, then walk up the ramp. Use the fallen pylon to climb out into the daylight.

Leave the medic where he is for now. Ignore both doors in the courtyard, get into the broken vent and crawl down and left. Once the Black Ops have finished talking batter your way out with guns blazing. There is another waiting to the right of the truck, and two more down the road to the left. Once you've finished with them, walk over to the closed garage and press the button. Walk over to the other end of the silo, go through the door on the right. Knock out the Limpet Mines and Sentry Turret here if you haven't already. Back in the courtyard, get the Medic's attention and lead him all the way back to the Engineer. Once he's fixed up lead them both back to the locked door in the courtyard.

You can save your men here by quickly running in as soon as the Engineer gets the door open and taking down the Turret, but it's difficult and thanks to poor A.I. the Medic has real difficulty getting through the door. Take out the mines then down the corridor to meet more soldiers. This bit is an extended battle with Black Ops; try to keep the soldier with the SAW alive for as long as possible. First enter the storeroom down the corridor on the left to fight assassins. Once they're dead go up the stairs and open the blast doors. Stroll down the platform. More Black Ops await you at the far end. Fight your way across the tracks, left and left again; plenty of supplies dotted around. Make plentiful use of explosives. Across the tracks again, left and down to the stairs at the end (beware an ambush from the room to the right). Turn the crank to reveal the train. Get down to it and reverse it down the tracks (if there are any of your soldiers left, this is the point where you kill them and take their ammo) past the junction. Hit the direction box, then ride the train off to the right.

Keep chugging along. Duck to avoid a trailing wire. As you reach the end, beware a final Black Ops stationed to the left. Once he's dead get down, collect supplies and then crawl into the room with the fallen pipe. You need to position a crate near it to get up onto the pipe itself, avoid the wire. Get up into the ceiling space, crawl through the vent to end the chapter.

Next Chapter: We Are Not Alone