I just recently watched the king on Netflix. There was the scene where the battle of agincourt happened where everyone was in mud. In reality, how would soldiers identify enemies with all of the chaos? How was it not wanton friendly kills?
This is covered in the Very Frequently Asked Questions, with additional links further down that thread - though caution should be exercised, as the ones linked are older answers.
For bonus, here's u/Henry_V_Rex weighing in on the matter of The King specifically, courtesy of the Day of the Dead event some weeks ago.