British soldiers march, fire machine gun during World War I Dardanelles campaign

The video discusses the strategic planning of an invasion force landing on a peninsula. British troops, primarily assembled on the island of Lemnos, were the main force due to limited French availability from the Western Front. A total of 120,000 men were gathered under the leadership of British General Sir Ian Hamilton.

How many men were assembled for the operation?

Who was the commander of the assembled forces?