When the revolt was proclaimed in February 1944, he was in charge of he Irgun activities, and was later appointed to the General Headquarters as chief operations officer. Eitan supervised each operation from the moment the target was selected, through the planning to the implementation stage.
He was arrested on April 4, 1946 after the sabotaging of the railway tracks in the south. He was sentenced, together with his comrades, to 15 years imprisonment, but two years later, was freed in the Acre jail break.
He was sent clandestinely to Europe to organize action against British targets there, and on May 15, 1948, he returned home to take part in the war of Independent.
Was active In the Herut movement and served as member of the Eighth to the Tenth Knesset.