You can achieve this thru manipulation of the expeditionary forces and allied objective features of this game...its simply the skill of the player with the ability to figure them out that makes allied cooperation lackluster.
I know but thats to far from reality for my liking and also doesnt deal with certain issues.
For example: In a game as Germany I invaded the USSR. My Rumanian Allies deployed almost their entire army in Russia. But in one area and behind my front which crippled my troops because of supply problems. Setting objectives in their own country didnt work. Historically Rumanian, but also Hungarian, Italian and Spanish, forces were under control of an German Army or Army Group.
Another example is North-Africa. You can send in German troops to help but you cant control the Italian forces and again they deploy a huge amount of forces so the offensive to save the Italians is stopped dead in its tracks again because of supply issues.
The best example is D-Day. This was a combined effort and American, Canadian and British forces landed along the coast at the same time supported by fleets and air forces from several countries. All under the command of one general, Eisenhower, who commanded SHAEF. And D-Day was supported by a Russian offensive that started around the same time because the Allies shared their plans with Stalin!
What I am looking for, and that’s where the battle plans come in as a steppingstone, is a real SHAEF for the Allies. So when you play Enlgand and you invade France you don’t have to hope to get some American support or vice versa. When you play Germany all forces of your Allies in Russia automatically are under German control…etc
Now dealing with these issues isnt easy but sharing detailed and specific plans is a step in the right direction. The next step could be to implement an event for the set up of SHAEF and it would be controlled by whoever the human player (England or USA). Inclusing all forces under the command of SHAEF!
