Flagstaff War: Unhappy with translational differences regarding the Treaty of Waitangi, chiefs Hōne Heke, Kawiti and Māori tribe members chop down the British flagpole for a fourth time and drive settlers out of Kororāreka, New Zealand.

The Flagstaff War, also known as Heke's War, Hōne Heke's Rebellion and the Northern War, was fought between 11 March 1845 and 11 January 1846 in and around the Bay of Islands, New Zealand. The conflict is best remembered for the actions of Hōne Heke who challenged the authority of the British by cutting down the flagstaff on Flagstaff Hill at Kororāreka. The flagstaff had been a gift from Hōne Heke to James Busby, the first British Resident. The Northern War involved many major actions, including the Battle of Kororāreka on 11 March 1845, the Battle of Puketutu on 8 May 1845, the Battle of Ōhaeawai on 23 June 1845 and the siege of Ruapekapeka Pā from 27 December 1845 to 11 January 1846. The conflict is seen as one of the first of the New Zealand Wars.

The Treaty of Waitangi, sometimes referred to as Te Tiriti, is a document of central importance to the history of New Zealand, its constitution, and its national mythos. It has played a major role in the treatment of the Māori people in New Zealand by successive governments and the wider population, something that has been especially prominent from the late 20th century. Although the Treaty of Waitangi is not incorporated as a binding international treaty within New Zealand's domestic law, its status at international law is debated. It was first signed on 6 February 1840 by Captain William Hobson as consul for the British Crown and by Māori chiefs from the North Island of New Zealand. The treaty's status has clouded the question of whether Māori had ceded sovereignty to the Crown in 1840, and if so, whether such sovereignty remains intact.

Hōne Wiremu Heke Pōkai, born Heke Pōkai and later often referred to as Hōne Heke, was a highly influential Māori rangatira (chief) of the Ngāpuhi iwi (tribe) and a war leader in northern New Zealand; he was affiliated with the Ngati Rahiri, Ngai Tawake, Ngati Tautahi, Te Matarahurahu and Te Uri-o-Hua hapū (subtribes) of Ngāpuhi. Hōne Heke fought with Hongi Hika, an earlier war leader of the Ngāpuhi, in the Musket Wars. Hōne Heke is considered the principal instigator of the Flagstaff War in 1845–46.