Quote
"The Battle of Guadalcanal (Operation Watchtower) marked the first time that Allied (primarily US) forces had won a land battle against the Imperial Japanese Army."
With all due respect to our Great and Powerful friends:
By September 1942, unaided Australian troops had already forced the Japs into retreat on the Kokoda Track in New Guinea. The turning point of that battle was at Imita Ridge on Setember 15th, within sight of Port Moresby.
The first land victories were won by Aussies, not US troops.
(Oops, meant to insert this link as evidence
The Battle for New Guinea