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Half-Life 2: Episode One Hints
Fourth Group
1 of 8: Since you can't retrace your steps from before, you'll have to find some way to get past that newly fallen train car that's blocking the main floor.
2 of 8: Get your rocket launcher ready, since there will be several soldiers right outside to blast.
3 of 8: Let them see you, then hang back and shoot them with rockets and/or the crossbow. (Remember that there's lots of crossbow ammo in the nearby locker.)
4 of 8: When all the nearby soldiers are down, make a run to the rocket crate.
5 of 8: Stay behind the cover of the crate and dumpster, since an APC is going to drive up a ways ahead and start firing homing rockets at you if it can see you.
6 of 8: As soon as the APC and all nearby soldiers are dead, run for Barney's building to get your next group, then run back for the maintenance building at full speed.
7 of 8: As you enter the maintenance building, the doors directly across from you on your floor will start beeping, indicating that they're about to be blown open.