The Irgun (Hebrew: אִרְגּוּן; full title: הָאִרְגּוּן הַצְּבָאִי הַלְּאֻמִּי בְאֶרֶץ יִשְׂרָאֵל Hā-ʾIrgun Ha-Tzvaʾī Ha-Leūmī b-Ērētz Yiśrāʾel, lit. "The National Military Organization in the Land of Israel"), was a Zionist paramilitary organization that operated in Mandate Palestine between 1931 and 1948. It was an offshoot of the older and larger Jewish paramilitary organization Haganah (Hebrew: "Defense", הגנה). When the group broke from the Haganah it became known as the Haganah Bet (Hebrew: literally "Defense 'B' " or "Second Defense", הגנה ב), or alternatively as haHaganah haLeumit (ההגנה הלאומית) or Hama'amad (המעמד‎). Irgun members were absorbed into the Israel Defense Forces at the start of the 1948 Arab–Israeli war. The Irgun is also referred to as Etzel (אצ"ל), an acronym of the Hebrew initials, or by the abbreviation IZL.