Axis submarines have a busy day in the mid-Atlantic. 350 miles West of Gibraltar, Italian submarine Marconi sinks British SS Baron Lovat (all rescued) and Swedish SS Taberg (15 killed). At 5.03 AM 250 miles West of Cape Verde Islands, U-106 sinks British SS Sacramento Valley (3 killed, 39 survivors in a lifeboat and a jolly boat rescued on June 9 by British MV Caithness, 7 rescued from a jolly boat on June 24 by Panamanian tanker Stanvac Calcutta). At 8.24 PM 930 miles Northwest of the Azores, U-43 sinks Dutch SS Yselhaven (24 killed, 10 survivors in a lifeboat rescued by Finnish steamer Hammarland on June 15 and taken to Norfolk, Virginia, USA). At 11.25 PM 630 miles Northwest of the Azores, U-48 sinks British SS Tregarthen (all 45 hands lost).
Hitler issues Guidelines for the Treatment of Political Commissars (Commissar Order, Kommissarbefehl) during the upcoming invasion of USSR, ordering that Soviet political commissars should be shot.