This book investigates how the German-Ottoman Alliance affected the Turkish Nationalism during the Second Constitutional Period (1908-1918), focusing on two lesser known but crucial players of the Alliance: Ahmed Emin (Yalman, 1888-1972) and Ernst Jäckh (1875-1959). After the First World War, both men had reputations as being liberal, pro-American journalists. This book explores their papers and investigates their wartime activities and connections, and shows how they helped the German-Ottoman Alliance to take root. Ahmed Emin, a graduate of the German School in Istanbul, was sent by the Ottoman Minister of War, Enver Pasha, to the German Front during World War I and through his German and Turkish writings, advocated strongly for the promotion of the German-Ottoman Alliance. Ernst Jäckh was a consultant to Emperor Wilhelm II in his Eastern affairs and made several trips to the Ottoman Empire. In the process he built up a reputation as being Turkish-Jäckh among German imperialist circles due to his Young Turkish connections. Through their writings and the various institutions they enrolled, they both became key figures of the German-Ottoman Alliance. Also by evaluating the writings of the Ottoman political elite of the Era on Germany this book shows how the so-called German spirit was constructed by the Ottoman political elite, including Ahmed Emin. It also clarifies how certain elements of German nationalism were appropriated into Turkish nationalist thinking by the channel of German imperialists, including Ernst Jäckh. Opposing the common view that the support for the German-Ottoman Alliance was limited only to a certain clique of the Committee of Union and Progress, this book seeks to answer how the mainstream intellectuals of the Second Constitutional period who supported the Alliance protected their reputations after World War I, and how this German-Ottoman Alliance gave Turkish nationalism a German character.