On the 18th August Maurice took up a strong position at Bislich, not far from Wesel, where the River Lippe empties itself into the Rhine. Mondragon, with his army strengthened by reinforcements from garrisons in Gelderland, and by four hundred men brought by Frederic, van den Berg from Grol, had advanced to a place called Walston in den Ham, in the neighbourhood of Wesel. The Lippe flowed between the two hostile forces. Although he had broken up his siege, the prince was not disposed to renounce his whole campaign before trying conclusions with his veteran antagonist. He accordingly arranged an ambush with much skill, by means of which he hoped to bring on a general engagement and destroy Mondragon and his little army. His cousin and favourite lieutenant, Philip Nassau, was entrusted with the preliminaries. That adventurous commander, with a picked force of seven hundred cavalry, moved quietly from the camp on the evening of the 1st September. He took with him his two younger brothers, Ernest and Lewis Gunther, who, as has been seen, had received the promise of the eldest brother of the family, William Lewis, that they should be employed from time to time in any practical work that might be going, forward. Besides these young gentlemen, several of the most famous English and Dutch commanders were on, the expedition; the brothers Paul and Marcellus Bax, Captains Parker, Cutler, and Robert Vere, brother of Sir Francis, among the number. Early in the morning of the 2nd September the force crossed the Lippe, according to orders, keeping a pontoon across the stream to secure their retreat. They had instructions thus to feel the enemy at early dawn, and, as he was known to have foraging parties out every morning along the margin of the river, to make a sudden descent upon their pickets, and to capture those companies before they could effect their escape or be reinforced. Afterwards they were to retreat across the Lippe, followed, as it was hoped would be the case, by the troops: of Mondragon, anxious to punish this piece of audacity. Meantime Maurice with five thousand infantry, the rest of his cavalry, and several pieces of artillery, awaited their coming, posted behind some hills in the neighbourhood of Wesel.