In July, the Muslim attack turned on Fort St Michael, Senglea. To prevent the Turks from entering Galley Creek a large iron chain was erected across its entrance.

The Turks carried some small boats, over the Xebb ir-Ras peninsula from Marsamxett harbour, to infiltrate the waters in front of Senglea and to launch a sea attack.

Stakes were put in the seabed to prevent access to the unwalled part of Fort St Michael.

The stakes and the cannons of the Knights managed to remove the threat of this attack by the sea. The forts of Senglea and Birgu began to suffer the guns of the Turks.

In August, the Turks attacked simultaneously Senglea, Birgu and Fort St Michael. Although at one point the walls were breached and it looked like the siege was over, the cavalry from Mdina attacked the Turkish camps in Marsa. The Turks believed that a major relief force had arrived and were scared.

The Turks continued attacking Senglea and Birgu. It is not clear what happened at Birgu at this point, but it seems that the Grandmaster La Vallette himself went on the walls to help in the defense. Even siege towers were used on Fort St Michael (Senglea), but engineers of the Order tunnelled through the rubble and destroyed them by chain shot.