During the 21-year long Siege of Candia, Ottoman batteries easily neutralized the fort's firepower. The Ottomans eventually took the fort in 1669, after the Venetians surrendered the entire city. They did not make any major alterations to the fort, except for the additions of some battlements and embrasures. They built a small fort known as Little Koules on the landward side, but this was demolished in 1936 while the city was being "modernized".