- Second World War (1939-1945)
- Oberleutnant (1st Lieutenant)
- Chef 2. / I. / Flak-Regiment 8
- Awarded on:
- December 9th, 1942
During the defensive battles along the German blocking position between the Volga and Don rivers (north of Stalingrad) on 26-27.08.1942, Oberleutnant Oster and his Batterie especially distinguished themselves. In these two days Oster and his men destroyed a total of 17 enemy tanks and damaged a further 7, some of these in close combat. For this accomplishment Oster would be awarded the Knight’s Cross.