 Complete the following phrase:  In 1580, a square sconce and a church were built in Delfzijl. Fortification was expanded with six bastions in 1591. Also In 1591 Prince Maurice of Orange visited the port with a fleet of 150 ships which saw the capture of the city from the Spanish by a combined Dutch and English army. Followoing this an unsuccessful attempt was made in 1594 by Francisco Verdugo to capture the fortress Delfzijl. In 1628 Piet Hein moored his silver fleet at Delfzijl. The first sea battle in the Eighty Years War was fought nearby in 1658 in the Eems estuary between Dutch forces under Jan Abels and Spanish forces under François van Boshuizen. A fleet of Dutch ships from the West Indies landed here in 1665 under command of admiral Michiel de Ruyter, avoiding the English fleet that was blockading the Dutch coast. The fortification and the sluices were damaged during the 