Battle of Kepaniwai

Part of Unification of Hawaii

ʻĪao Valley

Date	1790
Location	Maui
Result	inconclusive

Belligerents

Hawaiʻi Island

Maui

Commanders and leaders

Kamehameha I
Kekuhaupiʻo

Kalanikūpule

Strength

1200

The Battle of Kepaniwai ("Battle of the Dammed Waters of ʻĪao" or Kaʻuwaʻupali, "Battle of the Clawed Cliffs") was fought in 1790 between Hawaiʻi Island and Maui. The forces of Hawaiʻi were led by Kamehameha I, while the forces of Maui were led by Kalanikūpule. It is known as one of the most bitter battles fought in Hawaiian history.Coordinates: 20°52′51″N 156°32′42″W / 20.88083°N 156.54500°W / 20.88083; -156.54500

While Maui's king Kahekili II was on Oʻahu, Kamehameha's war fleet landed in Kahului a few kilometers from the base of ʻĪao Valley. An army consisting of around twelve hundred skilled warriors led by Kamehameha and Kekuhaupiʻo, advanced on Kahekili's son Kalanikūpule and other Maui chiefs blocking the ʻĪao valley. The two armies were evenly matched and neither side broke after two days of fighting. On the third day Kamehameha's army was helped by the use of two cannons (named "Lopaka" and "Kalola") operated by John Young and Isaac Davis, two of Kamehameha's royal advisors. Although none of Maui's major chiefs were killed, many people died resulting in the "damming of the waters" by the corpses floating in the river. It was said that the river "ran red with the blood of the dead." Chiefess Kalola and her granddaughter Keōpūolani were able to escape west through the valley to Olowalu and north to Lahaina.

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