From: Madrid, Spain
What I mean is how many should you build to have enough. I understand the chain. Is there a magic number.
From memory you should have at least 50-55 to have all resources linked, that's one transport per zone. This number should be increased in order to accomplish movement of troops, supplies and amphibious operations, the more the better, then again you have to acquire a balance in your production line between tf and other units.
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