[1] The first official French military mission to Greece occurred in 1828–31, as part of the Morea expedition.
[1][2] Another mission under General Antoine Gramat [fr] came to Greece in 1918 as part of its participation in World War I, staying on until March 1923, when it was withdrawn on Greek request, citing budgetary constraints but most probably as a political gesture towards France.
[2] As the political situation in Greece stabilized, following the Asia Minor Catastrophe and the collapse of the Megali Idea, a major effort to reorganize the state and its institutions was undertaken, although Greek finances were limited, and the country was further burdened by the presence of over 1.5 million Asia Minor refugees.
General Adolphe Guillaumat, who knew Greece as the wartime commander of the Allied Army of the Orient in 1917–18, arrived in October to assess the situation, and make recommendations to the French government.
[3] The mission was also crucial in the publication of the (heavily French-influenced) Great Military and Naval Encyclopedia (Μεγάλη Στρατιωτική και Ναυτική Εγκυκλοπαιδεία) in 1927–30.