The appointment of so young a man as Sir Francis Vere to a post demanding not only military ability but great tact and diplomatic power, was abundant proof of the high estimate formed of him by the queen and her counsellors. The position was one of extreme difficulty. He had to keep on good terms with the queen and her government, with the government of the States, the English agent at the Hague, Prince Maurice in command of the army of the Netherlands, the English governors of the towns, and the officers or men of the force under his own command. Fortunately Barneveldt, who at that time was the most prominent man in the States, had a high opinion of Vere. Sir Thomas Bodley, the queen's agent, had much confidence in him, and acted with him most cordially, and Prince Maurice entertained a great respect for him, consulted him habitually in all military matters, and placed him in the position of marshal of the camp of the army of the Netherlands, in addition to his own command of the English portion of that army. Vere's first undertaking was to lead a force of 12,000 men, of whom half were English, to prevent Count Mansfeldt from crossing the Maas with an army of equal strength. Prince Maurice was present in person as general-in-chief. Intrenchments were thrown up and artillery planted; but just as Mansfeldt was preparing to cross his troops mutinied, and he was obliged to fall back. In October, with 900 of his own troops and twelve companies of Dutch horse, Sir Francis Vere succeeded in throwing a convoy of provisions into the town of Rheinberg, which was besieged by a large force of the enemy. As soon as he returned the States requested him to endeavour to throw in another convoy, as Count Mansfeldt was marching to swell the force of the besiegers, and after his arrival it would be well-nigh impossible to send further aid into the town. Vere took with him 900 English and 900 Dutch infantry, and 800 Dutch cavalry. The enemy had possession of a fortified country house called Loo, close to which lay a thick wood traversed only by a narrow path, with close undergrowth and swampy ground on either side. The enemy were in great force around Loo, and came out to attack the expedition as it passed through the wood. Sending the Dutch troops on first, Vere attacked the enemy vigorously with his infantry and drove them back to the inclosure of Loo. As soon as his whole force had crossed the wood, he halted them and ordered them to form in line of battle facing the wood through which they had just passed, and from which the enemy were now pouring out in great force.