ORIGINAL: Bullwinkle58
Horn Island is a key for isolating Darwin. Supplies DO NOT flow up the track from Alice Springs. If you don't care about losing Darwin then losing Horn is no big deal. If you want to keep Darwin (hard ) you'd better get supplies moving from the Perth side now.
Agreed, though I think holding Darwin is just about impossible vs. an attentive Japanese player. Horn Island is important, but there's no reason the Japanese can't take it unless they are neglectful or really tied-up elsewhere. A brief foray into the Coral Sea by KB is pretty much all the aircover you need to clear Horn Island and PM in January, and Japan has the troops available. I personally like to send 4th Division toward Rabaul right from Dec 7th, and that unit is all the muscle you need to clear PM, Horn Island, Darwin, and anything else you feel like up there.
I suppose the USN can stop it, but a quick show of KB is probably all you need to completely clear the Coral Sea for the week or so you need to land on those spots







