The McDonald Papers, Part II, Chapter 2: Marquis de la Rouerie (Col. Armand)
Among the adventurous spirits who had joined the Breton association and who were the most devotedly attached to the daring chief that conducted it, were several officers who had served under him in the United States, together with major Chafner, an American gentleman of intrepidity and enterprise and one of his most intimate friends and admirers. Major Chafner had been deeply engaged in the conspiracy from its commencement. An important and active part in the drama was reserved for him, but in which he was not to appear until the breaking out of the insurrection. The confederates were again ready to unfurl the royal banner, when some precipitate and unauthorized movements were made by their friends in Finisterre and the Ardèche. Immediately afterward, the catastrophe of the 10th of August occurred, and in the subsequent month the duke of Brunswick commenced his retreat.--These unpropitious events which followed close upon each other, discouraged the whole west of France then ready to break out into insurrection, and the rising of the royalists was consequently postponed although the organization was continued. A combination so extensive as this, which comprised the whole of Brittany, and the greater part of La Vendée could not for any length of time remain concealed. Among the conspirators was Latouche-Cheftel, a young Breton physician residing in Paris who oppressed by the secrets confided to him faltered under their weight, and, after hesitating for some time, at length disclosed the whole plan to his friend, Danton, the most audacious of the revolutionists. Emissaries were now sent into Brittany for the purpose of arresting La Rouërie.