Lord Uxbridge was ordered to get the cavalry together at the head-quarters (Ninove) that night, leaving the 2d hussars of the King’s German legion on the look-out between the Scheldt and the Lys. The troops in Brussels, composed of the 5th, or Picton’s division, the 81st regiment, and the Hanoverian brigade of the 6th division, called the reserve, were to be in readiness to march at a moment’s notice. After the Duke had completed his arrangements for the concentration of the army, his Grace, with many of our officers, went to the celebrated ball, given, on the eve of the memorable engagement at Quatre-Bras, by the duchess of Richmond, at her residence, now _Nº 9, Rue des Cendres, Boulevard Botanique_, near the _Porte de Cologne_. The saloons of the duchess were filled with a brilliant company of distinguished guests. The officers in their magnificent uniforms, threading the mazy dance with the most lovely and beautiful women. The ball was at its height, when the duke of Wellington first received _positive_ intelligence that Napoleon had crossed the Sambre with his whole army and taken possession of Charleroi. The excitement which ensued, on the company being made acquainted with Napoleon’s advance, was most extraordinary. The countenances which, a moment before, were lighted up with pleasure and gaiety, now wore a most solemn aspect. The duke of Brunswick, sitting with a child (the present prince de Ligne) on his knees, was so affected, that in rising he let the prince fall on the floor. The guests little imagined that the music which accompanied the gay and lively dances at her Grace’s ball, would so shortly after play martial airs on the battle field, or that some of the officers present at the _fête_ would be seen fighting in their ball dresses, and, in that costume, found amongst the slain. At about the same time, his Grace also received information from his outposts in front of Mons, and from other sources, which proved that the enemy’s movement upon Charleroi was the real point of attack, and he immediately issued the following orders: “BRUSSELS, 15th June, 1815. “AFTER-ORDERS.—TEN O’CLOCK, P.M. “The 5th” (Picton’s) “division of infantry, to march on Waterloo at two o’clock to-morrow morning. “The 3d” (Alten’s) “division of infantry, to continue its movement from Braine-le-Comte upon Nivelles. “The 1st” (Cooke’s) “division of infantry, to move from Enghien upon Braine-le-Comte. “The 2d” (Clinton’s) “and 4th” (Colville’s) “division of infantry, to move from Ath and Grammont, also from Audenaerde, and to continue their movements upon Enghien. “The cavalry, to continue its movement from Ninove upon Enghien. “The above movements to take place with as little delay as possible. “WELLINGTON.”