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• Weather data for 1 Apr 1944

• Light carrier Ryuho arrived at Saipan, Mariana Islands. ww2dbase [Main Article | Tabular Record of Movement | CPC]
• USS Franklin crossed the International Date Line. ww2dbase [Main Article | CPC]
• Cruiser Köln was recommissioned for training of cadet engineers with Fregattenkapitän Hellmuth Strobel in command. ww2dbase [Main Article | CPC]
• USS Flying Fish sank a Japanese transport off Okinawa, Japan, hitting her with 2 of 2 torpedoes fired. ww2dbase [Main Article | CPC]
• US bombers unintentionally hit Schaffhausen, Switzerland, leading to official protests and reparation payments. ww2dbase [Main Article | TH]
• The Japanese Navy 12th Air Fleet was reorganized to contain two air flotillas, one communication unit, one weather observation unit, and one air base unit. ww2dbase [CPC]
• The Japanese attack on the Broadway site of Operation Thursday in Burma was repulsed. ww2dbase [Main Article | CPC]
• Masafumi Arima was assigned to the fleet command for the Central Pacific area. ww2dbase [Main Article | CPC]
• Pedro del Valle was made Commanding General of the Third Corps Artillery, US III Marine Amphibious Corps. ww2dbase [Main Article | CPC]

• USS Yorktown (Essex-class) aviators struck the island of Woleai in the Caroline Islands. ww2dbase [Main Article | DS]
• The crew of USS Harder rescued a downed aviator on a small island west of Woleai, Caroline Islands. ww2dbase [Main Article | CPC]

• Barbers Point Naval Air Station: Air Group 100 commissioned this date. (AG-100 is a pilot replacement air group) ww2dbase [Main Article | DS]

• Japanese troops captured Nippon Hill near Imphal, India. ww2dbase [Main Article | CPC]

• USS Portland screened fleet carriers as their aircraft struck enemy installations located in the Woleai, Caroline Islands. ww2dbase [Main Article | Event | DS]

• Allied bombers attacked Schaffhausen, Switzerland, mistaking it for the German city of Ludwigshafen am Rhein, killing 40 people; interestingly, a group of small factories producing munitions and aircraft parts to be sold to Germany was destroyed in this accidental raid. ww2dbase [CPC]

• Fuel refinery No. 6 came online at Takao Guard District in southern Taiwan. ww2dbase [Main Article | CPC]

1 Apr 1944 Interactive Map