 The battalion headed eastwards on 15 August, briefly crossing the Eure River on the 17th.The commanding officer, Lt. Col. Hernandez, was killed on 20 August whilst observing indirect fire, and succeeded by his executive officer, Major Gallagher; in the same action, two Panzer V tanks were destroyed for the loss of one M10, the first tank destroyer lost in action by the battalion.After operating along the Seine for several days, the battalion withdrew southeast to rest on the 25th.