The year 1632 witnessed a renewal of military activity and was memorable for the famous siege and capture of Maestricht. This fortress held the same commanding position on the eastern frontier as Hertogenbosch on the southern; and, though its natural position was not so strong as the capital of North Brabant, Maestricht, lying as it did on both sides of the broad Meuse, and being strongly fortified and garrisoned, was very difficult to invest. The stadholder, at the head of a force of 17,000 infantry and 4000 horse, first made himself master of Venloo and Roeremonde and then advanced upon Maestricht. Unfortunately before Roeremonde, Ernest Casimir, the brave stadholder of Friesland and Groningen, was killed. He was succeeded in his offices by his son, Henry Casimir. Arriving (June 10) before Maestricht, Frederick Henry proceeded to erect strongly entrenched lines of circumvallation round the town connecting them above and below the town by bridges. Supplies reached him plentifully by the river. To the English and French regiments were once more assigned the place of honour in the attack. All went well until July 2, when Don Gonzales de Cordova led a superior Spanish force from Germany, consisting of 18,000 foot and 6000 horse, to raise the siege, and encamped close to the Dutch lines on the south side of the river. Finding however no vulnerable spot, he awaited the arrival at the beginning of August of an Imperialist army of 12,000 foot and 4000 horse, under the renowned Pappenheim. This impetuous leader determined upon an assault, and the Dutch entrenchments were attacked suddenly with great vigour at a moment when the prince was laid up with the gout. He rose, however, from his bed, personally visited all the points of danger, and after desperate fighting the assailants were at last driven off with heavy loss. The Spaniards and Imperialists, finding that the stadholder’s lines could not be forced, instituted a blockade, so that the besiegers were themselves besieged. But Frederick Henry had laid up such ample stores of munitions and provisions that he paid no heed to the cutting of his communications, and pushed on his