A large army was sent from the empire’s eastern provinces to Italy, where the commanders set about raising auxiliaries. The Normans were always eager for battle and loot, and so a corps of several hundred knights joined the army. Among its leaders was one William de Hauteville, accompanied by two of his younger brothers.
The force crossed the Straits of Messina, and met with initial success. But after two years, the expedition fell apart from factional squabbles. First, the Normans abandoned the enterprise. They punched far above their weight and were crucial to several victories, but felt they received an inferior share of the spoils. Then a conflict between the Byzantine general and admiral caused the former to be recalled to Constantinople, dooming any chance of victory.