In his extraordinary letter of  the 14th December 1841, Baron Friedrich von Gagern recalled the occurrences on the 15th June 1815 and the reaction to the news of the French advance as far as the crossroads of Les Quatre Bras by the general staff: ‘General Perponcher issued the order to concentrate the 1st Brigade at Nivelles in case of an alarm; and to stay on the road from Nivelles to Bruxelles; he did not know how to take responsibility to withdraw troops from that road, by sending reinforcements to Quatre Bras, therefore, I was immediately sent to the main headquarters in Braine-le-Comte to ask for instructions. The Prince of Orange was in Bruxelles. General Constant-Rebècque, to whom I gave my report, had difficulty in believing what I was telling him, especially the evacuation of the road from Charleroi to Bruxelles by the Prussians, which he did not believe was probable.’ It should be noted that the entire contents of this file are also available in the on-line archive. 

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