 The Spanish fleet was attempting to relieve the Spanish held town of Middelburg which was under siege but the fleet under Boisot intercepted them and were victorious with the destruction or capture of nearly fifteen ships.Middelburg as a result then surrendered only nine days later along with Arnemuiden.In April 1572 the cities of Flushing, Veere and Arnemuiden, located on the island of Walcheren, had sworn allegiance to the Dutch prince.