He joined the Virginia Militia in 1780, as a substitute for his brother Jacob, and helped man a local fort for a short while.
The purpose of the expedition was to capture Fort Detroit, while subduing some of the intervening Native American tribes who had sided with the British.
Large numbers of the prisoners were killed after capture, but Christian, who was wounded during the fight, was given the personal protection of a Delaware warrior of some fame, Tom Lyons, who admired the young Fast's courage.
[3][4] Christian Fast's life as a Delaware lasted about a year, but when it became clear that his own home area was about to fall under their attack, he escaped and returned in time to warn his relatives and others in the vicinity.
[5] The story of Christian Fast has proven to be sufficiently exciting as to have been the subject of an adventure book written for young teens.