Half-Life 2 Walkthrough -> Chapter 5: Exit 17 [Episode One]
Squad 2. We return to the square, drones arrive and drop mines. We clear the way, enter the red building with Barney, take a new squad with us, and lead them to the depot. On the way back, Combines burst into the depot through the upper windows. We kill them with rockets, as there is a chest with infinite ammo nearby.
Squad 3. A sniper and several mines will appear in the square. On the way back to the depot, Elite Combines will appear; they will drop one of the train cars to the floor; you will have to go around it along the second floor along the far wall.
Squad 4. There’s a Combine combat vehicle in the square; we blow it up with rockets from afar. We kill the remaining Combines and withdraw the squad. At the depot, we kill the enemies who entered through the lower doors near the far wall.
Squad 5. We fight drones and Combine special forces. We take the last squad, Barney is with us. At the depot, we fight off the enemies standing on the roof of the train car.
Escape the Strider through the newly opened corridor. Climb the inclined container. Circle around it, then walk along the roof of the inclined container. Cross the catwalk near the wall. At the end of the path, turn left and pass between the train cars. Climb to the second floor, where we find rockets behind cover and launch them at the Strider. A little further on lies a chest with infinite rockets.
We leave the city, witnessing the citadel explode along the way, sending capsules containing aliens flying out in all directions. The Earth invaders are now cut off and have no contact with their home planet. In this state, they are vulnerable, but they will have to be found and destroyed for a long time to come.
Congratulations! The first episode is complete, and it’s time to tackle the second!
See also:
Episode One: Excessive anxiety