another thing, that really boggles me, is the global scale of the Atlantic war. mebbe not as big in distance as the Pacific war, but it extended from Freetown to Pola to Archangelsk to Argentia, then Trinidad & Sao Paolo got added in. & every item (bootlaces, toothpaste, underpants, bullets, bombs, or 105 arty shells) had to be created from stock, moved to the ports, then loaded on to ships, convoyed to Britain, unloaded, distributed, then reloaded for the D-day assault.
Terminus can moan about how reading some of this history is boring. 's true, 97% of history ain't very interesting, & won't make a good read. but say you spent your war making tires for B-26 bombers, or mebbe you spent your war allocating shipping-space for tires, that's a dull read, too - Terminus can yawn. 'cept that those tires were made, shipped, & fitted to bomber sqns on the front-edge, that needed continuous supply of bombs and underpants, as well as personal mail, tools & toothpaste.
in AE, if you establish a forward base, you've got to push supplies in, and bring the nav support ships.