The siege was commenced by Mahomet on April 6, 1453. Much time had been occupied in conveying the cannon from Adrianople. There were two very interesting incidents in the siege which are worth recording. The one was the breaking of the close blockade of the port by four powerful and well-manned Genoese galleys, bringing provisions and stores to the beleaguered city from Chios. They sailed across the Marmora and up the Bosphorus with a strong breeze in their favour. The Sultan sent against them a hundred and forty of his fleet of smaller vessels propelled by oars. They found great difficulty in stemming the heavy sea. The four larger Genoese vessels came down on the smaller craft, crashing against them and shivering their oars. Their crews hurled big stones on the Turkish galleys and emitted against others the inextinguishable fire of which the Greeks had the secret. The Turkish boats could make no headway against the superior weight of the bigger vessels. A large number of them were sunk with serious loss of life. When near to the entrance of the harbour the wind died off and the Genoese vessels were in imminent peril, surrounded as they were by the numerous Turkish craft. But at the last moment an evening breeze sprang up. The Genoese vessels were able to force their way through. The chain which prevented ingress to the harbour was lowered, and the relieving vessels were admitted. The Sultan had watched the naval battle from the shore. He spurred his horse some distance into the shallow sea in the hope of animating his sailors to greater efforts. He was bitterly disappointed at this first engagement of his new fleet. The next morning he sent for the admiral, Balta Oghlou, a sturdy Bulgarian by birth, and bitterly reproached him for his failure. He directed the admiral to be laid on the ground and held there by four strong men, while he was bastinadoed. Some historians state that the Sultan himself belaboured the unfortunate admiral with his mace.