The island was fortified by the Venetians due to its strategic location, controlling the entrance to the anchorage of Souda Bay (which is still an important Greek and NATO naval base). Although the rest of Crete fell to Ottoman control in the Cretan War (1645–1669), the fortress of Souda (along with the island fortresses of Gramvousa and Spinalonga) remained in Venetian hands until 1715, when they too fell to the Ottomans. During this time, the island served as a refuge for Cretan insurgents.