 Complete the following phrase:  The First Cavalry Armys experience and elevation of its commanders to the top of the military significantly influenced development of Soviet war doctrine in the interwar period. Although the cavalry armies were disbanded after the Russian Civil War, Red Cavalry reached 14 divisions and 7 independent brigades in 1929 and peaked at 32 divisions and two brigades in 1938, although few of them actually deployed to nominal strength. 1939 and 1940 were spent in massive reorganizations of the troops into mechanized and tank corps, their formation influenced by the Spanish Civil War and the Battle of France and their disbandment forced by the inability to properly supply and manage large formations. The role of cavalry was unexpectedly boosted by the setbacks suffered by mechanized forces in 