Following the siege, it was rebuilt as Saint Michael Cavalier (Maltese: Kavallier ta' San Mikiel), and was completed in 1581.
This prompted the Order's Grand Master, Juan de Homedes y Coscon, to strengthen the defences of the island.
Fort Saint Michael was extended to a fortified city named Senglea by Grand Master Claude de la Sengle during the Knights' preparations for the anticipated Great Siege of Malta.
Fort St Michael was severely damaged, as it had been the scene of some of the most desperate fighting and bombardment of the siege.
Fort St. Michael was converted to a cavalier, consisting of a tower with a casemated interior, which had a terrace platform with ten embrasures.