I played R.U.S.E sometime ago. 2 vs 2 on a large map.
I commanded the British & Commonwealth forces while my buddy was U.S.A and we fought Italy and Germany.
We both brought doom from the skies I constantly launched my Lancaster bombers and the U.S sent Flying Fortress bombers.
Then on the ground after quite some time of steadfast defending and buddy saving I launched my Guards Infantry, Firefly tanks, Cruiser tanks, and Churchill tanks right beside the American rangers infantry, Jackson mobile anti tank vehicles, and Sherman tanks. In addition I sent Canadian Skinks (awesome mobile anti air) and Canadian Saxons (decent mobile artillery) in a support role.
United Germany and Italy were defeated, not even the Maus and King Tiger tanks and Me-262 jets of Germany could stop our unity.