This reenactor does a fine job of reloading a flintlock rifle while running. He is attempting to recreate something from the Indian Wars in America, in the 1770s. My question is about the historical accuracy of what the video is attempting to reconstruct, and how it relates to American and European military practice.
vonadler on reddit gave an excellent summary of European schools of thought on military doctrine in the early(?) 18th century, here, and dismissed the rumour that the Swedish and Russian forces practiced reloading while marching: https://www.reddit.com/r/AskHistorians/comments/7qck4a/did_the_swedish_empire_have_a_tactical_doctrine/dspcjp9/
This appears to imply that running or marching while reloading was a practice native to America? The only account I can find from Europe, so far, was an account from the battle of Jena from a Prussian sergeant. He said that as they advanced through the fog to meet the enemy, they reloaded their muskets as they marched (this was not done while under fire).
I ask if anyone can clarify if there was a practice of marching while loading in the 18th or 19th century, or if it was the oddity of a couple of conflicts. The video's performance has lead me to become deeply curious in this matter.