Alright, I am making a custom game. It is called 'Tank Wars.' Basically the objective is simple, Force 1 and Force 2 are supplied one Commander (SCV), 4000 hit points. He can not build anything, so he must survive. If the tanks destroy the commander, you lose. Force 1 and Force 2 are also supplied bunches of factorys attached with machine shops. You have no resources or money, because it cost nothing to produce the tanks.
The tanks are already researched with Siege Mode also. So basically you mass to win by pushing with tanks into your opponents base. Cut of his supply factorys, and destroy the Commander. OK, I have some decent triggers already made, but I think I have some errors...
First, when the Commander is finally killed, it says "I failed to achieve victory."
Here is the trigger I have for this

:
"Players with Triggers:
CONDITIONS:
- Current player commands exactly 0 Commander.
ACTIONS:
- End scenario in defeat for current player.
Something wrong there?
Also, how would I make it to you don't need supply depots?