The rescued man proved to be a wealthy coal mine owner from the neighborhood of Cannelton, and in his gratitude some days later he presented Halfacre with a cheque for $5,000.
Again a pressure of the neighborhood was brought to bear, and Halfacre emigrated to the west. He started alone with his family from Omaha in a prairie schooner, intending to settle in the neighborhood of Denver. When twenty-five miles west of Ogallala he left his family in camp one afternoon and wandered some miles away over the plain in search of antelope.
When he returned some hours later he found his wife and children slain by the Indians and their mutilated bodies lying about the smoldering ruins of his wagon. The horses had been driven away.
Wild with grief and rage, he did the best he could in burying his dead, and then made his way back to Omaha. He met with much sympathy from the pioneers along the route, but for this he seemed to care but little. He went about in a gloomy, abstracted way that caused people to say he was losing his mind.
One day he appeared at a blacksmith shop in Omaha, and ordered a big wagon box made of plow steel, which he paid for in advance. When it was completed he loaded it upon a wagon and covered it with a white cover, until it looked like an ordinary prairie schooner. Into this he loaded a barrel for water and provisions enough to last for six months. He also stored in the iron box, a large quantity of ammunition, with two or three rifles and revolvers. The sides, bottom and top of the box were loopholed, protected with iron slides.
When all was ready he purchased horses and drove to the place near the Platte river, where his family had been slain. Here he picketed his horses and deliberately built a camp-fire. He did not have long to wait for results. The Indians saw the smoke, and seeing only one man, they swept down upon his camp. He waited until they were reasonably near and went inside his iron box. When they came to within a few yards, he opened fire from the loop-holes, killing a number of them before they retreated. The Indians could not make out the situation, and that night they crept through the grass and tried to kindle a fire beneath his wagon. Halfacre was alert, and shot them from the bottom loop holes. After two or three assaults, in which they lost many of their number, the Indians went away and ever afterwards avoided the place, as they believed it protected by evil spirits.
Halfacre lived in his wagon for more than a year, making incursions into the Indian camps at night, where his rifle dealt death.
To the Indians, he was an avenging spirit and they spoke of him in whispers. His remains were found some miles away, long afterwards by soldiers, who believed he had frozen to death in a blizzard. The rusted relic on the banks of the Platte River, slowly disappearing beneath the quicksands, was the only memento left of the tragedies there enacted.