The last major "Wolfpack" U-boat attack of World War Two took place, resulting in the loss of six U-boats. Convoy ONS 5 had been attacked by 40 U-boats over the course of a week, and had lost twelve of its party, ten on May 5, but it had been well defended, and the slow convoy marked the end of the Wolfpack.
Admiral King ordered the creation of the Naval Combat Demolition Units following prior successful frogmen operations.