 Complete the following phrase:  In the late spring of 536 Belisarius crossed into Italy, where he captured Rhegium and made his way north. Neapolis  was besieged for three weeks before the Imperial troops forced their way in during November. The largely barbarian Roman army sacked the city. Belisarius moved north to Rome, which in view of the fate of Neapolis, put up no resistance; Belisarius entered unopposed in December. The rapidity of the Byzantine advance took the Goths by surprise and the inactivity of Theodahad enraged them. After the fall of Neapolis he was deposed and replaced by Vitiges. He left Rome for Ravenna, where he married Amalasunthas daughter Matasuntha and began rallying his forces against the invasion. Vitiges led a large force against Rome, where Belisarius, who did not have enough troops to face the Goths in the open field, had remained. The subsequent 