The killing was received by President
Sanford B. Dole as an offense to the new government. Following the killing, Marshal
Edward G. Hitchcock dispatched the Kalalau expedition commanded by Captain William Larsen comprising a 35-man
platoon from the
National Guard of Hawaii, a
howitzer, and representative of the Board of Health, Executive Officer Charles B. Reynolds. The men were transported to Kalalau by the
Waialeale. They first stopped at
Hanalei on June 30 to get information about the situation in Kalalau. They found that police were guarding the paths between Hanalei and Kalalau. At this point, they were informed of the proclaimed martial law that all lepers were to be imprisoned within 24 hours, and after this time is up, they were to be taken dead or alive if they had not yet complied. Koʻolau was to lead a party of 12 armed with six rifles and six pistols. The party included himself, his son Kaleimanu, his wife Piilani being one of two women of the group, and Paoa. At the last moment Koʻolau decided to leave his group with the belief the party would be pursued more vigorously because of him. Piilani refused to go with the group and stayed with her husband despite his protests, Kaleimanu also went with Koʻolau to stay with his parents.
Landing The
Waialeale arrived at Kalalau July 1. Fifteen soldiers landed at noon in two skiffs without incident, only encountering civilians. Finding the shore safe the rest of the expedition was delivered and set up camp a mile inland. Soldiers were sent to guard the stream and the colony was searched finding leper leader Reverend
Kapahei "Judge" Kauai, three lepers were captured from a cave on the coast and a leper collaborator. On July 2, Wahinealoha, the collaborator, was deputized with the intent he would talk the lepers into surrender. The expedition moved another mile inland and established a base camp called "Camp Dole". Larsen fired five round from the howitzer against the eastern ridge of the valley with the intention of intimidating the lepers with the cannon's reports. The platoon advanced deeper into the valley. At noon, Wahinealoha returned with the message that a group of lepers were willing to surrender if Luther Wilcox were to meet with them. Wahinealoha, Kunuiakea, and Wicox met with a leper, after assuring well treatment the other eight lepers of Koʻolau's party came out of hiding and surrendered. The next day, the soldiers searched for Koʻolau around the east ridge of the valley. They used his sister as a way of capturing him; she was to call out to him and lure him out of his hiding place. This strategy failed because the valley was deserted and they did not find Koʻolau.
First assault On July 4, Koʻolau was discovered by Sergeant Major J. W. Pratt's group of 15 men. Koʻolau was with his wife Piilani and son Kaleimanu in caves in the slope of one of the western ridge of the valley. Pratt sent a four-man assault team to the cave while the remainder provided cover fire. Koʻolau shot the
point man Private John Anderson, a Norwegian, from the well-camouflaged ledge of the cave entrance as the team neared. After being shot, Anderson knocked two of his comrades off the mountain. He would die of his wound; the other two guardsmen survived their fall but Private Johnson was badly injured and the group withdrew back to Camp Dole. That afternoon the
Waialeale arrived in Honolulu with 15 lepers. Manuia led a group of four other lepers to
Hanalei, but were caught near
Haena and sent to Hanalei.
Second assault On July 5, Larsen commanded the second assault himself with 15 men. They found the body of Anderson. Larsen had one group commanded by him to provide fifteen minutes of suppressive fire on the cave while an assault group, commanded by Reynolds, entered the cave. This time the point man was a combat veteran of the
American Civil War, Private John McCabe who served in the
Union Army. McCabe led the assault group up to the entrance of the cave. As he attempted to climb over the ledge to the entrance of the cave, Ko'olau shot him in his chin and the bullet went through his brain. Once again the group retreated, but during the withdrawal, Private John Herschberg snagged his rifle on foliage and the gun went off killing him. The soldiers returned to camp with the three bodies. On July 6, Pratt commanded an artillery barrage of the leper's position with the howitzer and the guardsmen moved on with their hunt for lepers. Unbeknownst to them Koʻolau and his family fled the cave during the night before the bombardment. On July 7, Reynolds with six soldiers collected ten lepers at Hanalei that had been caught outside Kalalau aboard the
Iwalani and sent them to Honolulu.
Third assault William Owen Smith from the Board of Health found the war embarrassing and went to Kalalau himself aboard the
Iwalani that had delivered the prisoners to Honolulu and was to return to Kalalau. Smith arrived on July 10 with ten fresh soldiers, supplies, and three coffins. Smith found Larsen had given up on Koʻolau and went to the next valley with his men, searching for lepers. After hours of argument between the two, they returned to the cave with men to find it abandoned. Patrols were sent into the surrounding area to no avail. Smith, seeing the dense vegetation for himself, decided the manhunt was in vain and called off Larsen's campaign. ==Aftermath==