What made Churchill resign from the navy?

Winston Churchill resigned from the navy in 1915 due to his involvement in the failed Gallipoli Campaign during World War I, which he had championed as First Lord of the Admiralty. The operation aimed to secure a sea route to Russia and knock the Ottoman Empire out of the war but resulted in heavy Allied casualties and was deemed a failure. Facing criticism and political pressure, Churchill stepped down from his position in the navy to take on other roles, eventually serving in the trenches on the Western Front.