- Period:
- Second World War (1939-1945)
- Rank:
- Leutnant (2nd Lieutenant)
- Unit:
- Zugführer, 14. Kompanie, Grenadier-Regiment 899, 266. Infanterie-Division, Heer
- Awarded on:
- August 27th, 1944
Awarded for his actions along the Normandy front. Leutnant Claassen and his Pak guns held off US units near Pont Hebert for hours of fighting, an achievement that bought time for the defense of the St. Malo harbour to be prepared.