 A Dutch vanguard of 6,000 Dutchmen, Germans and Scots under Prince William of Nassau was dispatched ahead of the main army with orders to capture various forts and redoubts placed on the left bank of the Scheltd river.Initially the army was going to Bergen op Zoom, where Frederick Henry had sent 50 river barges, but then moved to Lillo.On the night of 13/14 June they crossed the Scheldt, landing at Kildreck, and easily occupied the Fort of Liefkenshoek, near the village of Kallo.