The following spring, Aristagoras and the Naxian exiles sailed with the fleet. Unfortunately for the success of the invasion, Aristagoras quarrelled with the Persian admiral Megabates. He interfered in the discipline of the latter over the ship captains to save a friend from harsh punishment for an infraction (failure to set a watch on his ship). Aristagoras saved his friend but lost the friendship and loyalty of the Persian admiral, who expected to be in overall command. The schism was irreparable, being the very first incident of the subsequent Ionian revolt. Megabates sabotaged the entire operation by secretly informing the Naxians that they were about to be attacked, taking away the element of surprise. Naxos then had enough time to prepare for a siege. Four months later, the siege still held, the Persians were out of supplies and had only limited funds remaining. The expedition was then considered a failure and the Persians sailed home.