June 13, 1944

According to the Chronology of World War II website, on June 13, 1944:

"On the Western Front... On the left of the Allied line, the British 2nd Army continues to attack. The 30th Corps regroups its forces. The 7th Armored Division is shift to the right flank and advances to Villers Bocage. A German counterattack forces the division to fall back. To the left, the US 1st Army makes progress towards St Lo and across the Cotentin. Pont l'Abbe is capture in the peninsula. A German counterattack, spearheaded by 17th Panzer Division, toward Carentan is held."

This was also the day that Grandpa landed on the beaches of Normandy.