Half-Life-Surface Tension

Gordon again reaches the surface, which is now a war zone. The Vortigaunts, along with Alien Grunts and Gargantuas, have begun making determined attacks against the Marines, and the tide of the battle is beginning to turn in favor of the aliens; the Marines call in reinforcements, but it is not enough. Gordon must scale cliffs and navigate the bombed out buildings while avoiding both opposing sides.