Imamura sought reinforcements for the Admiralties in late 1943 and early 1944. In October 1943 he requested an infantry division for the islands, but none was available. A subsequent proposal to transfer the 66th Regiment from the Palaus, where it was being rebuilt after suffering heavy losses, to the Admiralties was also unsuccessful as IGHQ believed that the Eighteenth Army had greater need for this unit. The Imperial Japanese Navy (IJN) also rejected Imamura's suggestion that a special naval landing force unit be dispatched to the islands. IGHQ agreed to deploy the 66th Regiment to the Admiralties in January 1944 to bolster the region's defences following the Allied landings at Arawe and Saidor in mid-December and early January respectively, but this movement was cancelled after a ship carrying reinforcements for the regiment was sunk by with heavy loss of life on the 16th of the month. Following this disaster Imamura directed the 38th Division to dispatch a battalion to the islands, and 750 men of the 2nd Battalion, 1st Independent Mixed Regiment arrived there on the night of 24/25 January. A subsequent attempt to ship an infantry and an artillery battalion to the Admiralties was frustrated by Allied air and submarine attacks, but 530 soldiers of the 38th Division's 1st Battalion, 229th Infantry Regiment arrived there on the night of 2 February. Most of these troop movements were detected by Allied intelligence.