There is no "ground war" in this game. There are ground vehicles, though. These GVs can be used to attack bases, but often times you'll find them clustered around the spawn points, either picking off new entries, or being picked off. Some folks even go so far as to park outside the hangar and shoot GVs rolling from it.
When used against towns they can be helpful, and even effective. However, the interaction of GVs with other GVs and objects and even the ground itself, is not very GV-like. It's because the game itself is a flight model based game, not a ground model based game.
Other than that, it can be fun to try and shoot GVs while in a GV, just don't expect it to be like the real war was