According to Wikipedia, Tomahawk was originally released in the UK under the title "Battle of Powder River". The reference for this is given as Monthly Film Bulletin, 18 (204), London, January 1, 1951, p. 217 and google searches return images of movie posters in that name. The title is erroneous, however, as the real Battle of Powder River took place just over the border, in Montana, in 1876, ten years after the events depicted in Tomahawk.