The Dutch army advanced by rapid marches to the neighbourhood of Ostend, and captured the fort and redoubts which the Spaniards had raised to prevent its garrison from undertaking offensive operations. Two thousand men were left to garrison these important positions, which lay on the line of march which the Spaniards must take coming from Bruges to Nieuport. The rest of the army then made their way across the country, intersected with ditches, and upon the following day arrived before Nieuport and prepared to besiege it. The Dutch fleet had arrived off the town, and co-operated with the army in building a bridge across the little river, and preparing for the siege. Towards the evening, however, the news arrived from Ostend, nine miles away, that a large force of the enemy had appeared before one of the forts just captured. Most of the officers were of opinion that the Spanish force was not a large one, and that it was a mere feint to induce the Dutch to abandon the siege of Nieuport and return to Ostend. Sir Francis Vere maintained that it was the main body of the archduke's army, and advised Maurice to march back at once with his whole force to attack the enemy before they had time to take the forts. Later on in the evening, however, two of the messengers arrived with the news that the forts had surrendered. Prince Maurice then, in opposition to Vere's advice, sent off 2500 infantry, 500 horse, and 2 guns, under the command of Ernest of Nassau, to prevent the enemy from crossing the low ground between Ostend and the sand-hills, Vere insisting that the whole army ought to move. It fell out exactly as he predicted; the detachment met the whole Spanish army, and broke and fled at the first fire, and thus 2500 men were lost in addition to the 2000 who had been left to garrison the forts. At break of day the army marched down to the creek, and as soon as the water had ebbed sufficiently waded across and took up their position among the sand-hills on the sea-shore. The enemy's army was already in sight, marching along on the narrow strip of land between the foot of the dunes and the sea. A few hundred yards towards Ostend the sand-hills narrowed, and here Sir Francis Vere took up his position with his division. He placed a thousand picked men, consisting of 250 English, 250 of Prince Maurice's guard, and 500 musketeers, partly upon two sand-hills called the East and West Hill, and partly in the bottom between them, where they were covered by a low ridge connecting the two hills.