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• The first German U-boat base in France was opened at Lorient. ww2dbase [TH]
• German aircraft and minesweepers sank four British submarines (Narwhal, Spearfish, Shark, and Thames). ww2dbase [TH]
• Operation Lever: British Royal Navy Force H under Vice Admiral James Somerville returned to Mers-el-Kébir, Algeria. At dawn, Swordfish aircraft from carrier HMS Ark Royal scored several torpedo hits on French battleship Dunkerque, killing 154 and wounding 8. One torpedo hit patrol boat Terre Neuve, detonating depth charges, killing 8; shock waves from the explosion further damaged Dunkerque. ww2dbase [British Attacks on the French Fleet | CPC]
• British cruisers HMS Capetown and HMS Caledon and destroyers HMS Janus, HMS Juno, HMS Ilex, and HMS Imperial shelled Bardia, Libya near the Egyptian border at 0537 hours, sinking Italian ship Axum and damaged another merchant ship. Italian bombers arrived at 0820 hours, but caused no damage against the British warships. ww2dbase [CPC]
• British submarine HMS Shark, damaged by attacks from German auxiliary minesweepers M1803 (trawler Spitzbergen), M1806 (trawler Cuxhaven), and M1807 (trawler Mulsum) in Boknafjord near Stavanger, Norway on the previous day, became captured by the Germans. She was in the process of being towed by the German ships when she suddenly sank, killing 3. The remaining 32 crew members were rescued and became prisoners of war. ww2dbase [CPC]
• German radio stations played the song "Denn wir fahren gegen Engeland" for the first time. ww2dbase [CPC]

• German submarine U-34 sank Estonian collier Vapper south of Cape Clear, Ireland; 1 was killed and 32 took to lifeboats; German submarine U-99, which had chased Vapper for the past 90 minutes, observed the sinking. To the south, U-30 sank Egyptian ship Angele Mabro west of Brest, France, killing all aboard. ww2dbase [First Happy Time | CPC]

• Comandante Faà di Bruno departed La Spezia, Italy at 0855 hours for exercises, returning at 1210 hours. ww2dbase [Comandante Faà di Bruno | La Spezia, Liguria | CPC]

• Stephen Beattie was made the commanding officer of destroyer HMS Vivien. ww2dbase [Stephen Beattie | CPC]

• Clifton Cates was made the director of Marine Officers Basic School, at the Philadelphia Navy Yard in Pennsylvania, United States. ww2dbase [Philadelphia Navy Yard | Clifton Cates | Philadelphia, Pennsylvania | CPC]

6 Jul 1940 Interactive Map