27 September 1941
Eastern Front : The first rains fell on Eastern Front of the European War; mud began to become an issue for the attacking German forces.
Ukraine : German Army Group South captured Perekop , cutting Crimea from rest of Russian mainlaind.
South Atlantic : German submarine U-201 attacked Allied convoy HG-73 600 miles north of the Azores islands, sinking two merchant ships and the anti-aircraft ship HMS Springbank; 32 were killed, 201 survived. Another German submarine U-124 torpedoed and sank Norwegian cargo ship Siremalm from same convoy.
US : 14 Liberty Ships were launched in the United States; they were to be transferred to the United Kingdom via the Lend-Lease program.
Mediterranean Sea : Convoy Halberd inbound to Malta comes under heavy Italian air attack. An Italian torpedo bomber hit and damaged British battleship HMS Nelson in the bow with a torpedo in the Mediterranean Sea between Sardinia, Italy and Tunisia; HMS Nelson was escorting the Operation Halberd convoy for Malta , forced to retuen back to Gibraltar. One of the troopships in the convoy , Imperial Star was also hit by an Italian aerial torpedo but she was evacuated safely , all crew and troops abroad were taken by other ships before she sank.
Meanwhile Royal Navy submarine HMS Upright torpedoed and sank Italian torpedoboat Albatros between Sicily and mainland Italy. German submarine U-371 rescued 42 survivors. Royal Navy submarine HMS Tetrarch torpedoed and sank Italian cargo ship Citta di Bastia and then sank Italian coaster Kromottos in Aegean Sea. British minelaying cruiser HMS Abdiel and destroyers HMS Kandahar, HMS Jaguar, and HMS Griffin departed Alexandria, Egypt after sundown with supplies for Tobruk, Libya. This would be the final supply run for besieged city.
Abyssinia , East Africa : The Italian garrison at Wolchefit Pass in Abyssinia surrendered to British King’s African Rifles regiment.
Hawaii : Joseph Rochefort warned US commanders at Pearl Harbor, US Territory of Hawaii that the Japanese communication codes were being changed
Archangel , Kola Peninsula , USSR : HMS London arrived in Archangel, Russia with Lord Beaverbrook and Averell Harriman aboard for First Moscow Conferance to organise Lend Lease supplies to Russia
Ukraine : 23,000 Jews were massacred at Kamenets-Podolsk, Ukraine by SS Einsatzgruppen and Ukranian SS auxilaries