BOILERPLATE

 The Mysterious Boilerplate, The Victorian Robot.

Boilerplate is built by Professor Archibald Campion in the 1880s and unveiled at the 1893 World's Columbian Exposition in Chicago.
Designed for the self-proclaimed purpose of "preventing the deaths of men in the conflicts of nations," Boilerplate charges into combat during the Spanish–American War and the Boxer Rebellion.

Boilerplate is also active in the First World War, but disappears during the relief of Major Whittlesey's Lost Battalion, possibly having been captured by the Germans for study.