Weiss' Flakkorps repulsed the RAF ASSAF attacks against the German advance, inflicting a 56 percent loss rate. From 10 to 13 May 1940 Sperrle's air fleet was credited with 89 aircraft destroyed in dogfights, 22 by flak, and 233 to 248 on the ground. The most successful day recorded was on 11 May; 127 aircraft were claimed—100 on the ground and 27 in the air. In a notable incident, 8./KG 51—one of the air fleet's units, bombed Freiburg in error causing 158 civilian casualties and killing 22 children. To cover up the mistake, Nazi propaganda minister Joseph Goebbels blamed the British and French for the "Freiburg massacre".