WEDNESDAY, 28 JULY 1943 EUROPEAN THEATER OF OPERATIONS (Eighth Air Force) ANTISUBMARINE WARFARE (AAF Antisubmarine Command) In the Bay of Biscay, German submarine, U-404, is sunk by a B-24 of the 4th Antisubmarine Squadron (Heavy) and a Royal Air Force (RAF) Libera- tor of No. 224 Squadron, at 45-53N 09-23W.