HMAS Castlemaine and New Guinea convoy work

The watch point illustrates the routine but hazardous labour behind a campaign: escorting transports, detecting contacts, refuelling, and helping ships stranded on a reef. HMAS Castlemaine operated from Cairns and Townsville as a flotilla leader while troop and supply convoys crossed the Coral Sea to New Guinea. One radar contact nearly became a collision with a small American craft, showing the identification hazards within crowded Allied waters. Castlemaine's reef-rescue work, broken tow lines, and subsequent boiler cleaning make maintenance, seamanship, and local sea control central rather than incidental to the campaign.