[4] He entered the army in July 1789 at age 15 when he volunteered for the 9th Battalion of the National Guard of Dunkirk to fight the House of Austria, including in the Brabant Revolution.

[5][3] He then served in the Army of the North under Dumouriez, working as aide-de-camp to General Souham at the Battle of Tourcoing.

[3][5][6] Guilleminot participated in the Battle of Verona in 1799 and was promoted to battalion commander by General Schérer.

[2][5] General Moreau also recognized his military excellence and called him up to the Army of Italy to serve as his aide-de-camp.

[5][2] In 1805, he moved to the historical and geographic services and was subsequently sent to Dresden, Germany to work as an engineer and cartographer for the military.

[5][3] After the war ended, he traveled to Turkey to inform the Ottoman Empire of the Treaties of Tilsit between France and Russia.

[5][2] In 1808, he was the first Frenchman sent to Bayonne, Spain for the Peninsular War, where he became chief of staff to Marshal Bessières and of the Army of the Western Pyrenees.

[5] The same year, he became the German Army's chief of topography services, where he worked alongside Marshal Berthier during the Danube campaign.

[9] Guilleminot was appointed to chief of staff to Charles Ferdinand, Duke of Berry by Marshal Davout in the meantime.

[3][7][6] When Bonaparte escaped exile and returned to power in 1815, Guilleminot was made chief of general staff of the 3rd Observation Corps and later the grand quartier général impérial in the Army of the North.

[5][6][2] Following this loss, Guilleminot was sent to negotiate the surrender of Paris to Prussian leader Marshal von Blücher.

[17] Guilleminot suffered from illness for a long time and eventually went to Baden, Germany for a change of air, hoping it would help.

[5][11] In 1814, the king appointed him a grand officer of the Legion of Honour and a knight of Order of Saint Louis.