With the rapid increase in white settlers into the country, the desire for land acquisition also intensified. Once again, conflict with the Kai Colo in the interior of Viti Levu ensued. In 1871, the killing of two settlers near the Ba River (Fiji) in the northwest of the island prompted a large punitive expedition of white farmers, imported slave labourers, and coastal Fijians to be organised. This group of around 400 armed vigilantes, including veterans of the U.S. Civil War, had a battle with the Kai Colo near the village of Cubu, in which both sides had to withdraw. The village was destroyed, and the Kai Colo, despite being armed with muskets, received numerous casualties. The Kai Colo responded by making frequent raids on the settlements of the whites and Christian Fijians throughout the district of Ba. Likewise, in the east of the island on the upper reaches of the Rewa River, villages were burnt, and many Kai Colo were shot by the vigilante settler squad called the Rewa Rifles.