Well, The game is like a shooting game?
You control this person and you use the mouse to shoot, It is possible to shoot the houses buildings and other stuff. You can buy like a different person that does different things (e.g Commander (shoots faster) Helicopter, Artillery i think?) The main thing is to kill the baddies. If i remember correctly is that there are sequels to the game? like (e.g Chaos Faction 1 --> Chaos Faction 2)
Hi @MinecraftProLord - The series you're looking for is called City Siege. There are quite a few of them. Here's a link to all the games: City Siege games.