The assault focused on a number of beaches at the southern tip of Gallipoli, called Cape Helles. The troops were brought on ships to within 50 yards of the beaches, and disembarked. There were ambitious plans to capture the peninsula in a few days.
The Allies immediately ran into trouble on the beaches, covered with barbed wire, with machine guns firing down from cliffs on both sides. Heroics of the Allied troops, including the Lancashire Fusiliers who famously won six Victoria Crosses before breakfast at W Beach, and the ANZACS at Chunuk Bair, were not enough.
Part of the problem was poor communications and high casualty rates among senior officers. The Allies did have enough troops to win, but failed to support each other quickly enough once they had landed on different beaches.
Although some Turkish trenches were captured, the Allies remained pinned down for months in their own trenches not far from the shore. The Kent Yeomanry came as reinforcements via V beach in October 2015.