It was ten o'clock at night when the first intelligence of the attack made by the French in the direction of Frasne, was received at the Prince of ORANGE's Head Quarters, at Braine le Comte. It was carried by Captain GAGERN, who, as previously mentioned (see page 70), had been despatched by Prince BERNHARD of Saxe Weimar, with his Serene Highness's report of the affair, to General PERPONCHER at Nivelles, and who was subsequently sent on by the General, with this information to the above Head Quarters. Lieutenant WEBSTER, Aide de Camp to the Prince of ORANGE, started soon afterwards for Brussels, with a report from the Dutch-Belgian Quartermaster General, DE CONSTANT REBECQUE, stating what had taken place, and detailing the measures which he had thought proper to adopt. These measures did not entirely coincide with the instructions above given, as issued by the Duke, because they were consequent upon the affair at Frasne, with which his Grace at that time was unacquainted; but they were perfectly consistent with the spirit of those instructions, inasmuch as they were not adopted "until the Enemy's attack upon the Right of the Prussian Army, and the Left of the Allied Army had become a matter of certainty." The Enemy's advance along the Charleroi road had already been successfully checked at Quatre Bras, and the necessity of immediately collecting at this important point, the troops ordered by the Duke "to be assembled that night at Nivelles" was too obvious to be mistaken. * * * * * A little before ten o'clock on the same evening, a further communication reached the Duke from Prince BLÜCHER, announcing the crossing of the Sambre by the French Army, headed by NAPOLEON in person; and the required intelligence from other quarters having arrived almost at the same moment, and confirmed him in the opinion "that the Enemy's movement upon Charleroi was the real attack," he issued, at ten o'clock P.M., the following Orders for the march of his troops to their Left:--ALTEN's Division to continue its movement from Braine le Comte upon Nivelles. COOKE's Division to move from Enghien upon Braine le Comte. CLINTON's and COLVILLE's Divisions to move from Ath, Grammont, and Audenarde, upon Enghien. The Cavalry to continue its movement from Ninhove upon Enghien. * * * * *