William had waited, until he believed that his right would have had time to fall upon the Irish left, and then ordered his centre to advance and force the passage at Old Bridge. The Dutch guards, whom William relied upon as his best and most trustworthy troops, advanced in splendid order to the river side, with their drums beating the march. When they reached the water's edge the drums ceased, and the soldiers entered the river. The stream rose as the dense column marched in and dammed it up, and the water reached the shoulders of the grenadiers, but they still moved on, in regular order, keeping their arms and ammunition dry by holding them above their heads. On the opposite bank, the hedges near the brink of the river were lined with skirmishers, while in the rear, in a hollow covered by some little hills, seven regiments of Irish infantry, supported by ten troops of horse and Tyrconnell's regiment of cavalry, were drawn up. The hills protected them from the fire of the British batteries, which passed over their heads. The Dutch troops continued their way unmolested, until they reached the middle of the river, when a hot fire was opened upon them from the Irish skirmishers; but the Dutch moved on, unshaken, and soon gained the opposite bank, where they rapidly formed up, the skirmishers retiring before them. Scarcely had the Dutch formed their squares, when the Irish horse burst down upon them at full speed, and charged them with impetuosity. They stood the charge unbroken, but again and again the Irish horse charged down upon them, with the greatest gallantry. William pushed two regiments of French Huguenots and one of British across the river, to the assistance of the Dutch guards, and ordered Sir John Hanmars and the Count of Nassau's regiment to cross, lower down the stream, to support them. As the supports were making a passage, General Hamilton advanced, at the head of a body of Irish infantry, to the water's edge, and, dashing into the river, encountered the French Huguenot regiments in the middle of the stream. A desperate fight ensued, but the French made their way across, and Hamilton, falling back with his infantry, opened to the right and left, permitting the Irish horse to charge through them. These rushed with fury upon the French regiment of Colonel La Callimot, and cut their way right through them. Then, wheeling, they charged them in flank again, broke them, and drove them into the river. La Callimot himself was killed, and but few of his regiment regained the opposite bank.