I think your referring to the Falaise (not spelled correct) massacre. They were decimated by attack planes caught in daylight. It's been awhile since I read about it but I believe over 200 German tanks were destroyed there.
No there wasnt.
Cutpaste from one message of mine elsewhere on same topic:
Medium / heavy tanks were NOT destroyed by .50s. End of discussion.
Even more, few tanks were destroyed from aerial attack at all.
British War Office analysis of 233 destroyed Panther tanks in 1944 revealed, that only 14 of those were destroyed by aerial attack. 11 with rockets, 3 with cannons.
During battle of Mortrain 7-10. August RAF and USAAF air forces claimed destruction of 252 German tanks destroyed. Germans only had 177 tanks and tank destroyers in that battle. Of those, 46 were lost. Nine were destroyed by aerial attacks. Seven by rockets, two by bombs.
During the German retreat to Seine, 388 AFVs were destroyed and examined. Of those only 13 were destroyed by aerial attack.
During the battle of Ardennes, of 101 destroyed AFVs only seven was destroyed by aerial attack. Claims were for 90.
During WHOLE Normandy campaign only about 100 tanks were destroyed to Allied air attacks. NONE of those were destroyed by .50s.
And this number from combination of British and American battlefield studies. No Germans tanks were destroyed by .50s during the battle of Normandy, German retreat or during battle of Ardennes.