What was the goal of the allies in the gallipoli campaign

Gallipoli campaign, 1915, Allied expedition in Ist World War to gain the Dardanelles's control and Bosporus straits, catch Constantinople, and freeing a Black Sea traveling path to Russia.

About the Gallipoli campaign:

The Gallipoli campaign was an expensive flop for the Allies, with an expected 27 thousand French, and 115,000 British and government bands killed or injured. The effort by the Allies to grab the Gallipoli peninsula from the Empire of Ottoman and achieve authority over the strategically-important Dardanelles lost in a turmoil of hubris, lifeblood, and pain.