However , he repeatedly switched his troops to where they were not needed .
After the winter , Hitler launched a fresh offensive in the spring of 1942 , with the aim of capturing the oil - rich Caucacus and the city of Stalingrad .
Hitler repeatedly switched Hitler 's troops to where they were not needed .
After the winter , Hitler launched a fresh offensive in the spring of 1942 , with the aim of capturing the oil - rich Caucacus and the city of Stalingrad .