The Hish was a corps

Corps

A corps is either a large formation, or an administrative grouping of troops within an armed force with a common function such as Artillery or Signals representing an arm of service...

 formed by the Haganah

Haganah

Haganah was a Jewish paramilitary organization in what was then the British Mandate of Palestine from 1920 to 1948, which later became the core of the Israel Defense Forces.- Origins :...

 in the British Mandate of Palestine in 1939 following the disbandment of the smaller mobilized force known as the Fosh. It was the Haganah's main surface corps, alongside Him and the Palmach

Palmach

The Palmach was the elite fighting force of the Haganah, the underground army of the Yishuv during the period of the British Mandate of Palestine. The Palmach was established on May 15, 1941...

.

1939 was a turning point for the Jewish Defence forces. Orde Wingate was transferred out of Palestine and the Fosh was replaced by a less mobile but permanent "Field Force/Corps", Heil Sadeh or the acronym Hish. The forces were formed with men with basic military training into Home Guard units, Heil Mishmar, Him. With Plugot Meyuhadot (Pum) as covert "Special Companies" to wage a counter terror war against the Arabs.

Units

The Hish consisted of the following brigades:

• Levanoni Brigade
  • Carmeli Brigade
  • Golani Brigade
    Golani Brigade
    The Golani Brigade is an Israeli infantry brigade that is subordinated to the 36th Division and traditionally associated with the Northern Command. Its symbol is a green tree on a yellow background, and its soldiers wear a brown beret. It is one of the most highly decorated infantry units in the...
    
    
• Kiryati Brigade
  Kiryati Brigade
  The Kiryati Brigade was formed in 1948 by David Ben-Gurion and was one of the original nine brigades that made up the Haganah. The Kiryati Brigade was initially responsible for securing the area in and around Tel Aviv...
  
  
• Alexandroni Brigade
  Alexandroni Brigade
  The Alexandroni Brigade is an Israel Defense Forces brigade that fought in the 1948 Arab-Israeli war. Along with the 7th Armoured Brigade both units had 139 killed during the first battle of Latrun - Operation Ben Nun Alef .The unit is currently a reserve unit.-Katz controversy:In 1998, Teddy Katz...
  
  
• Etzioni Brigade
  Etzioni Brigade
  The Etzioni Brigade , also 6th Brigade and Jerusalem Brigade, was an infantry brigade in the Haganah and Israel Defense Forces in the 1948 Arab–Israeli War. It was founded in late 1947 as the Field Corps unit responsible for the defense of Jerusalem and its surroundings, where it operated during...
  
  
• Givati Brigade
  Givati Brigade
  The Givati Brigade is an infantry brigade of the Israel Defense Forces, and serves as its amphibious force. Givati soldiers are designated by purple berets...