WW2 War Diary for Saturday, September 18, 1943:
Mediterranean
Italy: 5th Army captures Battipaglia. Germans retreat from Salerno bridgehead.
Sea War
Atlantic: RESUMPTION OF ‘WOLF-PACK’ OPERATIONS AGAINST CONVOYS following re-equipment of U-boats with electronic monitoring equipment, 8×20-mm anti-aircraft guns and acoustic torpedoes.
Pacific: US carrier strike on Tarawa.