I just tried 4v4 on the map Zhytomyr
me and my allie: soviets (hard)
enemy: wehrmacht (hard)
And my allie just built the mustering tent, and many conscripts..
That's it, he didn't move 'em or anything.. but 10 minutes later
He moved like in the next territory, and 10 minutes later a little bit further.. so I can't use the soviets as allies because they do practically nothing..