The first choice for me would be some episodes from the excellent "Battlefield" series: Series 1 - Ep. 04 - The Battle of Stalingrad; Series 2 - Ep. 03 - The Battle for Russia; Series 4 - Ep. 01 - The Battle of Kursk; Series 4 - Ep. 03 - Manchuria - The Forgotten Victory (not exactly Eastern Front, but an interesting episode); Series 4 - Ep. 06 - The Siege of Leningrad; Series 6 - Ep. 01 - The Battle for the Crimea.