At 0430 on 6 June 1944, elements of A Troop 4th Squadron, and B Troop 24th Squadron landed on the Saint-Marcouf islands. CPL Harvey S. Olson and PVT Thomas C. Killeran of Troop A (4th), and SGT John S. Zanders and CPL Melvin F. Kinzie of Troop B (24th) swam ashore armed only with knives to mark the beaches for the landing craft. They became the first seaborne American soldiers to land in France on D-Day. When the invasion began, the troops rapidly captured the islands with no resistance; the Germans had evacuated, but 19 men were killed or wounded due to enemy mines. On 7 June, just south of Utah Beach, a platoon of Troop B, 4th Squadron, linked up with elements of the 82nd Airborne and managed to ambush a German convoy in a mechanized cavalry charge, causing the enemy to retreat and leave behind 200 casualties. Rough seas prevented C Troop from landing, but they linked up with elements of the 101st on 8 June.