After Waterloo Guilleminot became chief of staff to Marshal Davout and he was designated a commissary and in that capacity on July 3, 1815 he signed an armistice with Blücher at Saint-Cloud.
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After the Polish campaign, as a lieutenant, he was appointed acting aide to General Gardanne, in the embassy of France to Persia (1807–1808); aide to General Armand Charles Guilleminot on his return in 1809; he was secretary of the Committee on Delimitation of Illyria, was promoted to captain (1810), and transferred to the Spanish army.