Codename Eagle is the predecessor of battlefield and is an excellent game to play over LAN with some friends. You can play this game even on the oldest computers and it loads of fun.
In the game you can just as you can in modern battlefield games drive and fly in all kinds of vehicles and use all kind of object.(parachutes, explosives) The game is only 160mb big and doesnt need to be installed you just have to extract it to play. Its fully 3d. However the single player doesnt work because it needs a cd for it.
To play the game you need to run the ce.exe file when you have extracted everything.
the game includes all the paches and a whole bunch of multiplayer maps.