[Discussed out of chronological order by Anna Komnene. Perhaps a mistaken doublet?] Alexios, learning of Robert Guiscard's renewed activities, called on Venice to arm a large fleet and promised to pay their expenses many times over. He also armed as many local vessels of all types as he could, manning them with those who had experience in naval warfare. When Guiscard heard of the arrival of the Venetians and their Byzantine allies, in a typically aggressive move he gathered his whole fleet in the harbour of Kassope. The Venetians put into Pasara, waited a little, then attacked at Kassope. Guiscard was defeated at Kassope, but with typical determination he prepared for a second battle two days later. The Venetians attacked then and won a more emphatic victory, returning to Pasara. Pietro Contarino, a Venetian deserter, encouraged Guiscard to try a third battle by reports of Venetian overconfidence. Guiscard's attack surprised them, and he won a splendid victory at Kerkyra, sinking many ships and capturing the rest. After his great victory he mutilated prisoners brutally and bargained mercilessly for ransoms. This made the Venetians fit out a bigger expedition soon after (surely months later, at least), which won a great victory near his camp at Butrinto. In this battle, Guiscard's son Guy and Guy's wife were almost captured. The Venetians were rewarded by a quarter in Constantinople (probably not for this victory)