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• British press reported details of development of radiolocation technology (later more popularly known by its American acronym RADAR) and its use in Battle of Britain. ww2dbase [TH]
• The keel for the civilian ship Steel Architect was laid down at Tacoma, Washington, United States by Todd Pacific Shipyards. ww2dbase [Copahee | CPC]
• German submarine U-552 sank British ship Norfolk 150 miles northwest of Ireland at 0438 hours; 1 was killed, 70 survived. ww2dbase [CPC]
• British destroyers HMS Faulknor, HMS Fearless, HMS Forester, HMS Foresight, and HMS Foxhound sank U-138 with depth charges 100 miles west of Gibraltar; all 27 German crew members of U-138 survived and were all taken prisoner. ww2dbase [CPC]

• Leonardo da Vinci departed Bordeaux, France at 1345 hours and sailed northward down the Gironde estuary, reaching Le Verdon-sur-Mer, France at 1815 hours. She then set sail for a war patrol at 2150 hours. ww2dbase [Leonardo da Vinci | Bordeaux, Aquitaine | CPC]
• Maggiore Baracca departed Bordeaux, France at 1226 hours and arrived at Le Verdon-sur-Mer, France at 1835 hours; she then sailed out of Le Verdon-sur-Mer to conduct gyrocompass tests at 1844 hours, returning at 1922 hours. At 2047 hours, she set sail for her fifth war patrol. ww2dbase [Maggiore Baracca | Bordeaux, Aquitaine | CPC]

• Hans-Joachim Marseille was granted medical leave; he would depart Libya for Berlin, Germany shortly. ww2dbase [Hans-Joachim Marseille | CPC]

18 Jun 1941 Interactive Map