Final answer:
The Gallipoli Peninsula was turned into a strategic base by Suleyman in 1354. During WWI, it was the focal point of the Gallipoli Campaign, a failed Allied attempt to control the Dardanelles and defeat the Ottoman Empire, leading to significant casualties and shaping national identities in Australia and New Zealand.
Step-by-step explanation:
In 1354, Suleyman established a strategic base on the Gallipoli Peninsula, which later played a crucial role during World War I. Specifically, in 1915, the peninsula was the site of the infamous Gallipoli Campaign. The campaign involved the British and the French attempting to secure the Dardanelles, a strategic waterway leading to the Ottoman capital of Constantinople (Istanbul). The goal was to force Turkey out of the war, thereby securing a southern supply route to Russia and opening a new front against the Central Powers. Despite this, the Allied forces faced stiff resistance from Turkish forces led by General Mustafa Kemal, who would later become known as Atatürk. The invasion turned into a disastrous and costly stalemate, resulting in heavy casualties on both sides, with approximately 900,000 troops killed or wounded before the Allies withdrew.