That enemy was motionless. Ney did not propose to attack until Napoleon should come up. Napoleon and his troops, arriving from the battlefield of Ligny, were not visible until within the neighbourhood of two o'clock. As he came near the Emperor was perceived, his memorable form distinguished in the midst of a small escorting body, urging the march; and the English guns, during one of those rare moments in which war discovers something of drama, fired upon the man who was the incarnation of all that furious generation of arms. In a military study, this moment, valuable to civilian history, may be neglected. The flood of French troops arriving made it hard for Uxbridge, in spite of his very numerous cavalry and supporting guns, to cover Wellington's retreat. The task was, however, not only successfully but nobly accomplished. Just as the French came up the sky had darkened and a furious storm had broken from the north-west upon the opposing forces. It was in the midst of a rain so violent that friend could be hardly distinguished from foe at thirty yards distance that the pursuit began, and to the noise of limbers galloped furiously to avoid capture, and of all those squadrons pursuing and pursued, was joined an incessant thunder. Things are accomplished in war which do not fit into the framework of its largest stories, and tend, therefore, to be lost. Overshadowed by the great story of Waterloo, the work which Lord Uxbridge and his Horse did on that afternoon of Saturday the 17th of June is too often forgotten. The ability and the energy displayed were equal. The first deployment to meet the French advance, the watching of the retirement of Wellington's main body, the continual appreciation of ground during a rapid and dangerous movement and in the worst of weather, the choice of occasional artillery positions--all these showed mastery, and secured the complete order of Wellington's retreat.[15] The pursuit was checked at its most important point (where the French had to cross the river Dyle at Genappe) by a rapid deployment of the cavalry upon the slope beyond the stream, a rapid unlimbering of the batteries in retreat, and a double charge, first of the Seventh Hussars, next of the First Life Guards. These charges were successful, they checked the French, and during the remainder of the afternoon the pursuit to the north of the Dyle slackened off until, before darkness, it ceased altogether. Indeed, there was by that time no further use in it. The mass of Wellington's army had reached, and had deployed upon, that ridge of the Mont St Jean where he intended to turn and give battle. They were in a position to receive any immediate attack, and the purposes of mere pursuit were at an end.