 Henry II returned to Germany in 1015 after being crowned Emperor by Pope Benedict VIII and prepared for a third invasion of Poland.With three armies at his command, the largest contingent since the beginning of the conflict in 1004, the Imperial army simultaneously marched in a pincer movement from the German north, south, and center.Henry II himself commanded the center army, supported by allied Slavic tribes, and moved from Magdeburg to cross the Oder river into Poland.