 Complete the following phrase:  After the German invasion began in June, 1941, Tsyganov served as deputy chief of staff of the Southwestern Main Directions rear services in August and September, before taking command of 38th Army during its unsuccessful defense of Kharkov in late September and October. However, after his army helped halt the German advance in November, in the following month the STAVKA appointed him to command of Southern Fronts 56th Army, which participated in that Fronts successful 