On 24 September, Mustafa Pasha ordered a massive assault upon the bastions of Spain, England, Provence, and Italy. After a day of furious fighting, during which the bastion of Spain changed hands twice, Suleiman eventually called off the attack. He sentenced Mustafa Pasha, his brother-in-law, to death for his failure to take the city, but eventually spared his life after the pleas of other senior officials. Mustafa's replacement, Ahmed Pasha, was an experienced siege engineer, and the Turks now focused their efforts on undermining the ramparts and blowing them up with mines while maintaining their continuous artillery barrages. The regularity of the locations where the mines were detonated under the walls (which generally rest on rock) has led to the suggestion that the Turkish miners may have taken advantage of ancient culverts of the Hellenistic city buried beneath the medieval city of Rhodes.^[2]