Pahikaua War (Principia Moderni IV Map Game)

The Pahikaua War, Hawaiian for the "Sword War", was a conflict primarily between the Kingdom of Hawaii and the Kingdom O'ahu, and is considered to be the second major conflict in the Unification of Hawaii. The war began in 1716, after a disagreement broke out between Kameʻeiamoku, Kuhina Nui and Chief of Puna, and Kahekili II of O'ahu, which resulted in the Kuhina Nui's death and the loss of his sword. The attack, supported by Hawaii's main rival, Kahekili II of O'ahu, led to war being declared by Kamehameha I of Hawaii soon after.

The Kingdom of Hawaii had annexed the Kingdom of Maui less than a decade prior, in the Kepaniwai War, which had previously saw conflict between Kahekili II and Kamehameha I. As such the Pahikaua War would also become a civil war on the island of Maui, split between the loyalist supporters of the King of Hawaii, and various rebelling chiefs, who elected Kahekili II's son, Kalanikūpule, as king following an invasion in 1717.