sentences:  The cold, hungry, and demoralized Second Army had to defend even longer and longer stretches of the frontline as more and more German units were sent to Stalingrad.Second Army, like other armies protecting the flanks of Sixth Army, was annihilated in the Soviet counter-offensives of the winter of 1942-1943.In Operation Uranus (19 November) Soviet forces drove through the Romanian Third Army and Romanian Fourth Army, trapping Sixth Army in Stalingrad.