The successful Turkish attacks and the surrender of parts of I and II Corps a few days later sealed the fate of the Hellenic Army, which began a hasty withdrawal to the Aegean shore.

On 29 August, while at Karaja Hisar, also known as Ali Veran (Greek: Ἀλῆ Βερὰν, modern Allioren, Turkey) near Kütahya, he was attacked by Turkish cavalry and surrendered along with slightly more than 5,000 men and 300 officers.

[4] His captors led Trikoupis and General Digenis (CO of II Corps) to Mustafa Kemal, who informed him that he had been appointed as commander-in-chief of the Army of Asia Minor, an episode highlighting the level of confusion in the Greek command.

He returned to Greece in 1923 as part of the prisoners of war exchange, but unlike other senior officers and politicians, who were charged for their role in the disaster in the Trial of the Six, he was never prosecuted.

He was eventually recalled to active service and promoted to lieutenant general, before finally retiring on 27 November 1927, after which he served as prefect of Attica and Boeotia.