This is what we do in game. Each neutral has a territory value and some kind of army and a few ships. You can attack them if you want. But u need to capture each neutral territory to get icp income.
If you lose battle then just that lone neutral joins other side.
But we also have a cost to try and influence a strict neutral to your side and you receive the territory value towards income and what is there for the ground troops and a possible ship. Nothing stronger than a Destroyer.
Not all countries can influence the same neutrals. We roll a d20 and a 4 or less u get neutral.
This is just an idea u may look at.
Spain and Turkey have the biggest Amy but cost more for those 2 to try and get.
50% bid placement rule
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I think the allies need a lot of help in Global. Trouble is, if the bid gets too big they can put it all in one theatre and unbalance the situation on one side of the map. So what I propose is a rule for bids that says you must place 50% of your bid on the Europe map and 50% on the Pacific map. If the bid is an odd number, you can place 50%+1 on one side. So for example if the bid is $17 you would have to place 8 or 9 in each side. This rule would allow bids to get a lot larger and give the allies a fighting chance, while keeping it reasonable on each side of the world.