For the first five months of his Irgun service, Nakar was active in recruitment and propaganda, but then moved into the Irgun's Combat Corps.
He participated in the Irgun attack on the Goldschmidt Officer's Club in Jerusalem.

On May 4, 1947, he participated in the Acre Prison break, an Irgun raid against Acre Prison to free imprisoned Jewish underground members.
Nakar was a member of one of the blocking squad that laid mines on nearby roads to delay British forces pursuing the attackers and escapees as they retreated.
The mining operation was successful, but during the retreat, Dov Salomon, one of the commanders of the operation who was responsible for calling away the blocking squads, forgot about his squad.
As a result, his squad was left behind, and was still waiting at its post when the British arrived and arrested them.
Others from the blocking squads taken prisoner were Avshalom Haviv, Yaakov Weiss, Amnon Michaelov, and Nachman Zitterbaum.
For the first five months of his Irgun service, Nakar was active in recruitment and propaganda, but then moved into the Irgun's Combat Corps. He participated in the Irgun attack on the Goldschmidt Officer's Club in Jerusalem.
On May 4, 1947, he participated in the Acre Prison break, an Irgun raid against Acre Prison to free imprisoned Jewish underground members. Nakar was a member of one of the blocking squad that laid mines on nearby roads to delay British forces pursuing the attackers and escapees as they retreated. The mining operation was successful, but during the retreat, Dov Salomon, one of the commanders of the operation who was responsible for calling away the blocking squads, forgot about his squad. As a result, his squad was left behind, and was still waiting at its post when the British arrived and arrested them. Others from the blocking squads taken prisoner were Avshalom Haviv, Yaakov Weiss, Amnon Michaelov, and Nachman Zitterbaum.
Meir Nakar