It’s a little hidden, so you might have to search for a second. Go through the building to the Combine wall and look for a little doorway by the fire. Kill the soldier who runs out after you cross, then go ahead and pull the lever to raise the bridge. They’ll lower the bridge so you can get across with your squad. Kill the soldier by the opening in the door. Drop through the hole by the wall and round the corner. There are about three soldiers and another Combine wall blocking the way. Work up the stairs and keep killing the Combine spread throughout the level. This is particularly deadly in these tight spaces. They really like to use grenades and shotguns. Round the corner and kill the soldier on the stairs. Help kill the Combine on the rooftop and wait for him to say the ingenious password and let you into their base. You’ll meet up with the same rebel who was by the gate a second ago. Drop down a level and walk past the sad couple. Go through the house until you get to a destroyed room with a metal Combine wall sticking into it. They’ll also be too busy killing the rebels outside. The iron grates on the window mean that you can’t fire out accurately and the combine can’t really fire in.
Go into the house and just keep moving through it.
