In 1831, he went to Africa. He commanded the expedition of
Bougie and was wounded in the leg while taking possession of the city on 29 September 1833. Called to replace
Louis Alexis Desmichels in the province of
Oran, he won several victories against the Zmalas and Douairs, commanded by
Agha Mustapha Ben Ismail, Chief of the Douairs, Agha Kadour Ben El Morsly, chief of the
Beni Amer (
Mounted infantry, and Agha Benaouda Mazari, chief of the Zmal. At the 16 June 1835 camp of
Valmy Figuiers (El Karma), a treaty was concluded between the Chief and General Trezel, whereby Zmal Douairs and recognized each subject, tributaries and soldiers of France. These tribes refused to pay the zakat (Ashura) was the
Emir Abd el-Kader. The general saw himself obliged to act against Abd-el-Kader to protect these tribes that wanted to punish the emir. This led to the disaster of the
Battle of Macta on 28 June, following another defeat the day before in the forest of Muley Ismail. In both attacks, Trezel was attacked by ten thousand men, when he had only 1,700 men and 600 horses. In his report to the governor, Trezel nonetheless called himself solely responsible for the disaster: "I submit without complaint and blame any severity that the royal government deems necessary to exercise to me... hoping he will not refuse to reward the brave who have distinguished themselves in these two fights. Count Erlon, who was governor, withdrew his command. Recalled to France, he returned to
Algeria the following year to take part in the
Constantine Expedition of 1836, during which he was seriously wounded and recalled to France. In 1837, during the Constantine Expedition of 1837 on the same city, he was given command of the 2nd Brigade. He was promoted to
lieutenant general on 11 November 1837 and became the staff director of the Department of War (15 May 1839) and committee member of staff. He was given the title
Peer of France on 21 July 1846. He became war minister under
Jean-de-Dieu Soult on 9 May 1847, instead of
Alexandre Pierre Chevalier Moline de Saint-Yon. He held these positions in the government of
François Guizot until the fall of the
July Monarchy on 24 February 1848. Automatically set to retire on 8 June 1848, in 1853, he was called by
Philippe d'Orleans and
Robert d'Orléans to become military governor and retained this office until the majority of the Comte de Paris in 1856. == Decorations ==