sentences:  On 22 June 1941, the Northwestern Front had two mechanised corps, the 3rd Mechanised Corps (Major General Alexey Kurkin) had 31,975 men and 669 – 672 tanks and the 12th Mechanized Corps (Major General Nikolai Shestapolov) had 28,832 men and 730 – 749 tanks; only BT-7s and T-26 tanks were available.The 4th Panzer Group advanced in two spearheads, led by the XLI Panzer Corps (General Georg-Hans Reinhardt) and LVI Panzer Corps (General Erich von Manstein).Their objective was to cross the Neman and Daugava, the most difficult natural obstacles in front of the Army Group North and to drive towards Leningrad.