 He had left his own son with La Valette, so he could hardly be indifferent to the fate of the fortress.Whatever may have been the cause of his delay, the Viceroy hesitated until the battle had almost been decided by the unaided efforts of the knights, before being forced to move by the indignation of his own officers.On 23 August came yet another grand assault, the last serious effort, as it proved, of the besiegers.