The battle opened about half-past eleven with a furious attack on Hougoumont. It was defended with desperate gallantry, mainly by the British guards, who reopened the old loopholes in the garden-walls, and closed by sheer muscular force the eastern gate of the yard, which had been forced open by the French. In the fruitless siege of Hougoumont, as it may be called, the French left wing thus wasted most of its strength, and incurred enormous loss. Meanwhile, the French right wing under D'Erlon, advanced to attack the British left, which had been assailed for an hour and a half by the fire of a battery with seventy-eight guns. The Dutch and Belgians, who in their exposed position had suffered severely from the French artillery fire, soon gave way; but Picton's division, after a single volley, charged with the bayonet and drove their assailants reeling backward, though Picton himself fell dead on the field. Without orders from Wellington, Lord Uxbridge, in command of the British cavalry, seized the opportunity, and launched the union brigade with other regiments upon the flying masses. This whirlwind of British horsemen swept all before it, slaughtering many of the French cavalry in passing, taking 3,000 prisoners, sabring the gunners of Ney's battery, and spiking fifteen of the guns. But their ardour carried them too far. By Napoleon's orders a large force of French cuirassiers and lancers fell upon their flank before they could take breath again, and their ranks were frightfully thinned in a disorderly retreat. But their charge had saved the day.