thousand horse, threw himself into Coeworden, strengthened and garrisoned that vital fortress which Spinola would perhaps have taken as easily as he had done Lingen, made all the neighbouring positions secure, and then fell back towards Wesel on the Rhine, in order to watch his antagonist. Spinola had established his headquarters at Ruhrort, a place where the river Ruhr empties into the Rhine. He had yielded to the remonstrances of the Archbishop of Cologne, to whom Kaiserwerth belonged, and had abandoned the forts which Bucquoy, under his directions, had constructed at that place. The two armies now gazed at each other, at a respectful distance, for a fortnight longer, neither commander apparently having any very definite purpose. At last, Maurice having well reconnoitred his enemy, perceived a weak point in his extended lines. A considerable force of Italian cavalry, with some infantry, was stationed at the village of Mulheim, on the Ruhr, and apparently out of convenient supporting distance from Spinola's main army. The stadholder determined to deliver a sudden blow upon this tender spot, break through the lines, and bring on a general action by surprise. Assembling his well-seasoned and veteran troopers in force, he divided them into two formidable bands, one under the charge of his young brother Frederic Henry, the other under that most brilliant of cavalry officers, Marcellus Bax, hero of Turnhout and many another well-fought field. The river Ruhr was a wide but desultory stream, easily fordable in many places. On the opposite bank to Mulheim was the Castle of Brock, and some hills of considerable elevation. Bax was ordered to cross the river and seize the castle and the heights, Count Henry to attack the enemy's camp in front, while Maurice himself, following rapidly with the advance of infantry and wagons, was to sustain the assault.