This is a fun little tank Java game. It was created back in 1997 on a site called Bonus.com under the name "Battlefield."
It's come back recently and I used to play it a lot when I was younger. It was very addicting. Let me know if you've played before or want to play and I could show you the ropes!
Don't be discouraged by the unpolished webpage they only recently got the code to bring it back online again!
Oh this is a multiplayer game also btw. And having several people on one team together gives you a very satisfying advantage. But if they other team has a bunch of people too it can make for some very epic battles.
Here's a quick video of the game.