Upon watching the Agincourt scene in The King on Netflix (which I would recommend, if with a few faults), it made me wonder, how would a medieval soldier be able to tell who their enemies are and who their comrades are, especially in large skirmishes, like the one we see in the film.
Apart from earlier answers on the topic of identification of combatants in medieval warfare in general, the eponymous King himself, u/Henry_V_Rex, recently answered a similar question during our Day of the Dead event.