Mahmud Barzanji
The Peshmerga have historically been Kurdish guerrilla forces combating the ruling power in the region of what is now Iraqi Kurdistan. Under Mahmud Barzanji, the Peshmerga fought against the occupying British after World War I. They also spearheaded revolts against the Iraqi government in 1931–1932 and against Iran in 1946–1947. Under the leadership of Mustafa Barzani, Peshmerga forces fought the Iraqi government in the First and Second Iraqi–Kurdish Wars of the 1960s and 1970s, and supported Iran in the Iran–Iraq War of the 1980s. The Peshmerga became divided between forces loyal to the Kurdistan Democratic Party (KDP) and those loyal to the Patriotic Union of Kurdistan (PUK), a split that led to the Iraqi Kurdish Civil War of 1995–1998. After the 2003 invasion of Iraq, the Peshmerga became the official military forces of the Kurdistan Region, ruled by a KDP-PUK coalition. The Peshmerga have played an important role in re-taking territory occupied by Islamic State of Iraq and the Levant.