Initially he was appointed captain of the repair ship "Ifaistos", before being sent to Britain to oversee the delivery to the Greek navy of four "Flower"-class corvettes. Likewise, in 1943 he was head of the acceptance mission for the "LST-1"-class tank landing ships in New Orleans. He personally assumed command of the LST "Samos" (L179). On 10 January 1944 he was promoted to captain (retroactive to 9 November 1943), and took part as commander of a landing ship squadron in the Allied landing operations in Anzio (January 1944), and Southern France (August 1944). For his service as captain of the "Samos", on 14 September 1944 he received the Greek War Cross, III class. For his general war service, and especially his actions during the Anzio landings, he received the Medal for Outstanding Acts on 11 December 1945.