Attila 6

I could snipe red without any problem. Purple is defensive, so I have no problems with them too.

The problems are green and orange.

Tried to destroy green only to get my army destroyed by their onager shots.

As for, orange is the worst nightmare, as they start their wonder after I enter green base. Orange is the reason why I cannot survive the game, their army is too big.

How do you clear this scenario, and which enemies do you defeat in order?