@SandyofCthulhu One account we know of is in the Battle of Agincourt, where the French wrote that Sir Thomas Erpingham raised his baton as an order to advance, and shouted something that probably means "Now strike!" which the French misheard as "nestroque" because that's what they wrote down.
@SandyofCthulhu The idea of the commands being so fine grained that they order each individual step: "nock... draw..." (commander waits for a while) "loose!" is probably not what regularly happens as keeping the bow drawn for any period of time is tiring.