Context: Japanese land forces continued to advance in the Solomon Islands and New Guinea. From July 1942, a few Australian reserve battalions, many of them very young and untrained, fought a stubborn rearguard action in New Guinea, against a Japanese advance along the Kokoda Track, towards Port Moresby, over the rugged Owen Stanley Ranges. The militia, worn out and severely depleted by casualties, were relieved in late August by regular troops from the Second Australian Imperial Force, returning from action in the Mediterranean theater. In early September 1942 Japanese marines attacked a strategic Royal Australian Air Force base at Milne Bay, near the eastern tip of New Guinea. They were beaten back by Allied (primarily Australian Army) forces.

Question: What mountains did the Australian battalions fight a rearguard action over on the Kokoda Track?
Answer: Owen Stanley Ranges

Question: What forces releived the worn Australian reserve battalions? 
Answer: Second Australian Imperial Force

Question: In 1942, what Australian Air Force base was attacked by Japanese marines?
Answer: Milne Bay

Question: Where was Milne Bay located in New Guinea?
Answer: eastern tip

Question: What theater did the Second Australian Imperial Force come from before they relieved the reserve battalions in New Guinea?
Answer: Mediterranean