Next time you're on a PATH train shuttling between Manhattan and Hoboken under the Hudson River, imagine the tunnel your train is traveling through. It's a cast-iron tube like this, dug for the Hudson & Manhattan Railroad Company and completed in 1908. The tunnels taking commuter trains between New York and New Jersey were called the Hudson Tubes, aka the McAdoo Tunnels, after William Gibbs McAdoo, who financed construction and led the efforts to link the two states by rail. (Ephemeral NY)
General Crook's field headquarters at Whitewood (Dakota Terr.) during the “Horsemeat March” of 1876 in pursuit of a band of Sioux fleeing General Custer's defeat at the Battle of Little Big Horn. After the battle of Slim Buttes, the Sioux burned the grass, and the American cavalry rode with reduced rations to allow faster pursuit; the cavalry had no food for men or horses, and the soldiers eventually had to shoot and eat their horses.