How the collapse of the Ottoman Empire sparked a new war for modern Turkey

History · Published 29 September 2026 Swipe more like this →

In short: Following the defeat of the Ottoman Empire in 1918, the Treaty of Sèvres attempted to partition its lands. However, a nationalist movement led by Mustafa Kemal rejected these terms, igniting a fierce conflict that ultimately reshaped the map of the region and established the foundations of the modern Turkish state.

The conflict, often framed as a continuation of the First World War, emerged from the ashes of the Ottoman collapse. While the Entente Powers sought to impose the Treaty of Sèvres in 1920, the Turkish National Movement, under the leadership of Mustafa Kemal, refused to accept the occupation of their territory. This resistance challenged the international order and set the stage for a brutal struggle for sovereignty in Anatolia.

In 1921, the Greek army launched an offensive into Anatolia, aiming to secure territories assigned to them by the Treaty of Sèvres, including Smyrna and parts of eastern Thrace. Despite initial advances toward Ankara, the Greek forces faced significant logistical hurdles and were eventually halted by the nationalist Turkish army. The turning point occurred at the Sakarya River between August and September 1921, where Kemal’s forces decisively repulsed the Greek advance.

By September 1922, the Turkish forces had reclaimed Smyrna, effectively driving the Greek military out of Anatolia. This defeat triggered a political crisis in Greece, resulting in a military coup against the monarchy. The conflict concluded with the Treaty of Lausanne in 1923, which forced Greece to relinquish its claims to Smyrna and return eastern Thrace, Imbros, and Tenedos to Turkey. Crucially, the treaty also mandated a population exchange, permanently altering the demographic landscape of both nations.

The war remains a pivotal moment in 20th-century history, marking the transition from imperial decline to the rise of modern nation-states. It highlights the volatile aftermath of the Great War, where the failure to establish a lasting peace led to further bloodshed and the redrawing of borders across the former Ottoman domains.

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