The Turkish army was under the command of Mustapha Pasha, and the fleet under that of Piali. Both had received orders not to take any steps without the advice of Dragut. It would have been far better for the Turkish cause had the Corsair been in supreme command, for his skill as an artilleryman was famous. But there had always been trouble in the Ottoman fleet when a Corsair was in command. The proud Turkish generals were unwilling to be under the orders of men who were of doubtful antecedents, and whom they despised in their hearts as low-born robbers. Even Barbarossa, acknowledged by all to be the greatest seaman in the Turkish Empire, could not enforce strict obedience in the campaign of Prevesa in 1538. The Grand Vizier Ibrahim had seen the folly of putting generals in command of fleets, and had therefore secured the promotion of Barbarossa: but Ibrahim was now dead, and Solyman, bereft of his wise counsel, made a compromise. On May 18 the Turkish fleet was sighted off the island, and almost immediately the army disembarked, partly at Marsa Scirocco, and partly at St. Thomas's Bay. The first misfortune was the non-appearance of Dragut at the rendezvous, and in his absence Mustapha and Piali decided to attack St. Elmo and to leave to Dragut the responsibility of sanctioning the operations or breaking them off. Batteries were erected on Mount Sceberras, in which ten 80-pounders were brought into action, besides a huge basilisk throwing balls of 160 pounds, and two 60-pounder _coulevrines_. The Turks at the height of their power put great faith in novel and massive artillery, which, though clumsy, and at times more dangerous to their own gunners than the enemy, was terribly effective at the short distance it was placed from St. Elmo. The walls of the fortress soon began to crumble under the continuous bombardment, and the garrison, which had been increased to 120 Knights and two companies of Spanish infantry, soon felt the position untenable without reinforcements. As an attack had not yet been delivered La Valette was incensed at the appeal for help and offered to go himself to hold the fort; his council dissuaded him from doing so, and he permitted 50 Knights and 200 Spanish troops to cross to St. Elmo. It was of the utmost importance that St. Elmo should be held to the last minute. Not only did it delay the attack on the main forts, but Don Garcia de Toledo, the Viceroy of Sicily, had made it a condition in his arrangements with the Grand Master, before the siege, that St. Elmo must be held if the reinforcements from Sicily were to be sent.