Meanwhile,[3] farther north, the Bastion of Castile had been almost captured by Piali.  The rock at that part of the fortification was extremely hard, and the possibility of mines had occurred to none of the garrison.  Piali, however, with great labour, had dug a mine which had been sprung that morning and had blown a huge gap in the ramparts.  This unexpected attack threw the whole of Il Borgo into confusion, and, but for the Grand Master’s promptitude and coolness of mind, the enemy had been masters of the fortress.  Seizing a pike, La Valette rushed into the fight, and, inspired by his example, the Knights succeeded in driving the enemy out of the breach.  He ordered the garrison to remain there all night, as he expected an attack under the cover of darkness, and insisted on taking the command himself.  His subordinates protested against this reckless exposure of a valuable life, but his precautions were justified when a Turkish attack made in the darkness was defeated by his prompt resistance.

The bombardment continued unceasingly, and on August 18 another desperate assault was made, which, like the other, failed.  Yet the position of the besieged was becoming desperate:  dwindling daily in numbers, they were becoming too feeble to hold the long line of fortifications; but, when his council suggested the abandonment of Il Borgo and Senglea and withdrawal to St. Angelo, La Valette remained obdurate.

Why the Viceroy of Sicily had not brought help will always remain a mystery.  Possibly the orders of his master, Philip ii. of Spain, were so obscurely worded as to put on his own shoulders the burden of a decision; a responsibility which he was unwilling to discharge because the slightest defeat would mean exposing Sicily to the Turk.  He had left his own son with La Valette, so he could hardly be indifferent to the fate of the fortress, and Malta in Turkish hands would soon have proved a curse to Sicily and Naples.  Whatever may have been the cause of his delay, the Viceroy hesitated till the indignation of his own officers forced him to move, and then the battle had almost been won by the unaided efforts of the Knights.  On August 23 came yet another grand assault, the last serious effort, as it proved, of the besiegers; it was thrown back with the greatest difficulty, even the wounded taking part in the defence.  The plight of the Turkish forces, however, was now desperate.  With the exception of St. Elmo, the fortifications were still intact.  By working night and day the garrison had repaired the breaches, and the capture of Malta seemed more and more impossible.  Those terrible summer months with the burning sirocco had laid many of the troops low with sickness in their crowded quarters; ammunition and food were beginning to run short, and the troops were becoming more and more dispirited at the failure of their numerous attacks and the unending toll of lives.  The death of Dragut, on June 23, had proved an incalculable loss,