With Greece's formal entry into World War I in 1917, he was operations officer of the 9th Infantry Division, while in 1918 he was promoted to lieutenant colonel and assigned as chief of staff of the 2nd Infantry Division. He retained this post for the next four years, during the division's service in Ukraine as part of the Southern Russia Intervention (1919), and later in Anatolia during the Greco-Turkish War of 1919–22.[2][3] He particularly distinguished himself during the decisive Turkish offensive in August 1922, where he repelled the Turkish attacks on his sector. During the subsequent Greek retreat to the Aegean shore, he served as chief of staff of I Army Corps and of Major General Athanasios Frangou's Southern Group of Divisions.[2]
Following the evacuation from Anatolia, he immediately joined the 11 September 1922 Revolution, becoming again chief of staff of I Corps and member of the 12-man Revolutionary Committee, under the chairmanship of Colonel Stylianos Gonatas, which demanded the led the army to Athens and secured the abdication of the government of Petros Protopapadakis and of King Constantine I.[3] Promoted to full colonel in 1923 and major general in 1928, he served as commander of the 10th and the 8th divisions and of II Army Corps.[3] In 1934 he was promoted to lieutenant general, assuming the post of Chief of the Hellenic Army General Staff in 1935, until his retirement in 1936.[3]
^Note: Greece officially adopted the Gregorian calendar on 16 February 1923 (which became 1 March). All dates prior to that, unless specifically denoted, are Old Style.
^ abcde Μεγάλη Στρατιωτικὴ καὶ Ναυτικὴ Ἐγκυκλοπαιδεία. Tόμος Ἔκτος: Σαράντα Ἐκκλησίαι–Ὤχρα [Great Military and Naval Encyclopaedia. Volume VI: Kirk Kilisse–Ochre] (in Greek). Athens: Ἔκδοσις Μεγάλης Στρατιωτικῆς καὶ Ναυτικῆς Ἐγκυκλοπαιδείας. 1930. p. 643. OCLC31255024.
^ abcdefgh"Αντιστράτηγος ΧΑΣΑΠΙΔΗΣ ΑΡΙΣΤΕΙΔΗΣ του ΓΕΩΡΓΙΟΥ, ΑΜ 5440". Συνοπτική Ιστορία του Γενικού Επιτελείου Στρατού 1901–2001 [A Concise History of the Hellenic Army General Staff 1901–2001] (in Greek). Athens: Hellenic Army History Directorate. 2001. p. 156. ISBN960-7897-44-7.
§ Substitute Chiefs of the General Staff for the Rear Areas/Interior (as opposed to the Field Staff) † Deputy Chiefs substituting during vacancies ‡ Under the title "Chief of the Army"