The Fort of St. Andreas is an elongated rectangular fortification with Venetian and Ottoman elements. It had four corner bastions and a wide defensive moat. Initially only the two eastern bastions were reinforced with stone since they were located near the sea and were vulnerable to an attack from that direction. Following Preveza’s liberation in 1912 the fort housed Greek army barracks. During the Second World War the Germans used the fort while the grand mosque within its walls was destroyed by Italian bombs. In 1944 the fort was the ground of fierce clashes between the communists (ELAS) and the republican (EDES) guerrilla groups. The fort was used by the Greek army until the 1990s.