 Complete the following phrase:  In November 1942 the Kalinin Front, along with the Western Front, launched Operation Mars against the German defenses in the a hrefBattles20of20RzhevRzhevVyazma salienta. The 3rd Shock Army, now allocated to Kalinin Front, started the operation on 24 November by attacking Third Panzer Army at Velikiye Luki, and the next day the Kalinin and Western Fronts assaulted the entire perimeter of the Rzhev salient. The offensive involved the 41st, 22nd, 39th, 31st, 20th, and 29th Armies from both Fronts. The Front was then involved in the 