Was Gallipoli a good idea badly executed?

The short answer

• Seeking a route around the west. British advocates of an eastern strategy looked to the Dardanelles, Salonika and Mesopotamia. Opening the straits might let Russian grain out and shells in, threaten a Central Power ally and encourage Balkan states to join the Entente. Each prospect depended on reaching it: troops, ships, supplies and expeditionary skills had to be brought over long routes, often without priority. A promising destination on a map was not yet an achievable operation.
• Italy changes sides. Although Italy belonged to the Triple Alliance, it remained neutral in 1914, arguing that the alliance was defensive. Both coalitions courted it in 1915. The Entente's secret Treaty of London on 26 April promised Trentino, Trieste and parts of Dalmatia, bringing an army of roughly 875,000 into the war. Italy received less than the wartime promises at the peace settlement. The grievance called “mutilated victory” later became part of Fascist politics.
• Bulgaria chooses the Central Powers. Defeated in the Second Balkan War of 1913, Bulgaria wanted Macedonia back from Serbia. By 1915 the stalled Gallipoli campaign and Russia's retreat made the Central Powers appear stronger and able to offer Serbian land. Bulgaria joined them in October and attacked Serbia. The resulting Berlin–Constantinople railway corridor joins their territories on the map.
• The eastern front gives way. The Eastern Front was roughly twice as long as the western line and held at lower troop density. Weaker Russian railways and shortages of rifles and other equipment made it harder to respond to a concentrated attack in 1915. Yet German chief of staff Falkenhayn doubted that eastern victories alone could decide the war: Russia's distances made a complete defeat difficult. The campaign nevertheless brought major gains and placed the Russian state under great strain.

What it changed

Russia's army and government. The Russian army recovered sufficiently to mount major offensives in 1916. The strain at home remained: refugees crowded cities, inflation reduced purchasing power, and Nicholas's absence at headquarters left government in Petrograd associated with the Tsarina and Rasputin. Defeat had become part of a wider crisis of confidence.

A Central Powers corridor. Serbia's defeat connected Berlin, Vienna, Sofia and Constantinople by land and rail. Guns, funds and other supplies could reach the Ottoman Empire more readily. The Central Powers now formed a connected bloc from northern Europe toward Mesopotamia, while the Entente continued to apply pressure at sea.

Gallipoli remembered. Churchill left office and later served in the trenches. Subsequent planners studied Gallipoli's amphibious failures, including during preparations for the Second World War. In Australia and New Zealand, where the campaign holds an important place in national memory, 25 April remains Anzac Day. Mustafa Kemal's role helped establish the reputation of the future founder of modern Turkey.

Naming the Armenian genocide. The Ottoman government used wartime institutions against its Armenian citizens, including gendarmes, requisition powers and transport. In May 1915 the Entente described the violence as “crimes against humanity”; the issue received much less attention in the final peace settlement. A later statement attributed to Hitler asked who remembered the Armenians, although its wording and source are contested. The marker makes remembrance part of the map's account of the war.