 Complete the following phrase:  The Commonwealth fleet blockaded Flemish ports but, to Cromwells annoyance, the military campaign started late in the year and was subject to many delays. Marshal Turenne spent the summer of 1657 campaigning against the Spanish in Luxembourg and made no move to attack Flanders until September. Mardyck was captured on 22 September and garrisoned by Commonwealth troops. Dunkirk was besieged in May 1658. A Spanish relief force attempted to lift the siege but was defeated on 4 June at the 