By the ordinance of 24 July 1828, he was then sent to Greece as a field marshal to participate in the Morea expedition (1828), under the orders of Marshal Maison, during the Greek War of Independence. At the head of the 2nd brigade of the expeditionary forces, he liberated the city of Navarino (on 7 October 1828) from the Turkish-Egyptian occupation troops of Ibrahim Pasha and then took the "Castle of Morea" of Patras (on 30 October 1828). Higonet stayed for a few months in Patras and he established there several health commissions for the freed but suffering Greek population, and even managed, in December 1828, to contain an outbreak of plague which was developing in the mountainous villages of Kalavryta and Vrachni. He finally left the Greek soil after four months of mission in the Peloponnese, on 9 January 1829, after having completely liberated Greece from the occupier. During this campaign, on 22 February 1829, he was promoted by king Charles X Commander of the Royal and Military Order of Saint-Louis and then, on his return to France, Commander of the Order of the Redeemer by the new independent Greek State, in 1830.