[First discussed out of chronological order by Anna Komnene.] With the lower water levels of drought, Guiscard's ships at the mouth of the Glykys were left high and dry, and could not be hauled to the sea. He solved this problem by directing the remaining water into a narrow channel by dykes made of piles and intertwined osiers, reinforced by trees and covered in sand. The water in the channel gradually rose, and allowed the ships to be refloated