charges. Labor disputes between some company mines and the union continued into the next decade. A similar labor confrontation in 1899 took place after the union was launching an organizing drive of the few mines not yet fully unionized, where miners working in the Bunker Hill and Sullivan mines were receiving fifty cents to a dollar less per day than other miners. With no success in the effort, on April 29, 250 union members seized a train in Burke at gunpoint, according to the engineer, Levi "Al" Hutton. At each stop through Burke Canyon, more miners climbed aboard what was dubbed the "Dynamite Express" toward the site of the $250,000 Bunker Hill mine near Wardner; the miners then carried 3,000 pounds (1,400 kg) of dynamite into the mill and completely destroyed it. The crowd also burned down the company office, the boarding house, and the home of the mine manager. Like in the 1892 strike, martial law was declared by Governor Frank Steunenberg and wholesale arrests and mass incarcerations were done to bring back order. Harry Orchard, who owned a share of the Hercules Mine at one point and played a significant role in the Colorado Labor Wars, returned to Idaho to assassinate former governor Steunenberg in 1905. The bombing assassination led to a nationally publicized trial in Boise. After a U.S. Geological Survey done in the 1890s, it became widely known that there were large quantities of white pine, a highly prized softwood, in the Coeur d'Alene Mountains. The lumber industry from the eastern US began to inventory the timberlands, acquire land, and invest in facilities across much of northern Idaho. This was welcome relief to the town of Coeur d'Alene, which had been reeling from the Panic of 1893, a flood in 1894, and the closure of Fort Sherman. The city experienced significant growth from the timber boom and the development of the railroads, steamboats, and tourism that accompanied it; Coeur d'Alene incorporated as a city on September 4, 1906, and by 1908 it had become the county seat. From 1900 to 1915, there were hundreds of homes constructed across 70 newly platted additions. With the advent of the automobile and the internal combustion engine, trucks and chainsaws, the felling and transporting of trees became more productive and efficient and lumber production reached its height in the late 1910s and 1920s; in 1925 there were seven lumber mills