In the aftermath of World War I, Greece attempted further expansion into Asia Minor, seeking to take advantage of the dissolution of the former Ottoman Empire where it laid claim to regions that were populated by Greeks, but was defeated in the Greco-Turkish War of 1919–1922. During the long drawn-out peace negotiations, a new contract was drawn up whereby Frederic and his sons undertook the publication between 1920 and 1926 of a number of illustrated books, volumes with titles "Smyrna", "Thrace", "Constantinople" and "The Greek Presence in Asia Minor," the text of which, he reported to the Greek government, "quite apart from the high artistic quality of the illustrations - reaffirms in the most categorical way the legitimacy of [Greek] claims over these contested regions." "La Campagne d'Epire" and its companion, "La Campagne de Macedoine" published 1920-21 both included his photographs and texts by Fernand Feyler, a retired Swiss colonel and military historian.