World War II Day-By-Day: Day 347 August 12, 1940: Germans try out their new tactics. Numerous coastal radar installations are bombed but most are repaired and operational by the end of the day, although Ventnor (Isle of Wight) is badly damaged and will be out of action for 2 weeks. Luftwaffe mounts heavy raids on British airfields in Kent (Manston, Lympne & Hawkinge). Portsmouth is also bombed, leaving 100 civilians dead. To test the effects of knocking out radar, Germans also attack convoys in the English Channel and Thames Estuary, sinking minesweeping trawlers HMT Pyrope (6 killed) and HMT Tamarisk (7 killed). Despite damage to radar and runways, RAF responds to most attacks and shoots down 55 German aircraft (for the loss of 6 Spitfires & 9 Hurricanes). Lutfwaffe loses 7 more bombers to anti-aircraft fire.