Update: You can eventually end the round by manually taking control of one of your reinforcement tanks and holding your mouse button down over the stuck enemy. Your tank will slowly kill it and let you move on. Again, GREAT game with a lot of potential, play it, enjoy it and rate it up.
Game is a lot of fun. Only minor "problem" I found is this is way too easy on normal difficulty, there is no challenge like that. I also found a small glitch that happens when you have a gazillion dollars and call in too many reinforcements at once that you can get the game stuck and not be able to end the round. I ended up with like 30 tanks up in their area just sitting there surrounding 2 enemy tanks and nothing shooting at anything. Overall a really great game.
 "Endless War: Defense")