Prior to 1755, British-American colonial forces and American Indians (hereinafter Indians) predominantly conducted the military campaigns in the North American theatre of European conflicts. From 1755 to 1815, however, the British Army itself became heavily engaged and had to consider its use of Indians as allies or auxiliaries. Indian War customs, such as torture, mutilation and killing of prisoners and civilians, were at odds with an emerging, although uneven, consensus against these practices in Europe. Therefore, British officials often had to decide if the use of Indians was compatible with their concept of military honour. The purpose of this inquiry is to determine whether the British concept of military honour hindered the effective use of Indians in the era of the Sixty Years' War (l755-1815). The author will attempt to persuade the reader that it did and it ultimately cost the British Empire its direct control of, then even its influence in, the American midwest.