The Defence of Sevastopol

S1, E3: Erich von Manstein's soldiers have trapped a massive Soviet force in Crimea, but the doomed troops have no intentions of surrendering, obeying Stalin's brutal "Not A Step Back" order. Manstein assembles the greatest concentration of artillery in history, which includes the world's biggest railway-gun nicknamed "Dora," and for eight months Soviets troops are savagely bombarded.