One of the trailers (I think Trailer 3), took place during the final battle.
And honestly, it was just one huge clusterfuck made of epic and win. Rebels fighting Combine Soldiers everywhere. Gunships strafing the player as they pass overhead (but not specifically targeting you), Combine Soldiers with RPG’s firing at Rebel Outposts. And all the while you had to go take out the Striders.
It seemed the like best battle ever, then I got the game. It sucked. Striders and Hunters, nothing else. Where’s my epic finale valve? Well turns out the playtesters thought there was too much going on and thought some parts were too hard. As a result it was severely dumbed down to the point where it became “Throw this thing at that thing and shoot it”.