In 1828, he was given command of the French expeditionary corps in Morea (the Peloponnese peninsula in Greece). This expedition consisted in a land intervention of the French Army in the Peloponnese at the time of the Greek War of Independence, with the aim of liberating the region from the Turkish-Egyptian occupation forces commanded by Ibrahim Pasha. The military expedition was also accompanied by a scientific expedition mandated by the French Academy. After the soldiers took control of the principal strongholds held by the Turkish troops (Navarino, Modon, Coron and Patras), General Maison was created a Marshal of France by Charles X on 22 February 1829. Although he returned to France after 8 months, the French kept a military presence in the area until 1833. He left Greece on 22 May 1829.