How did men (knights?) recognize each other in the heat of the battle, when everything was covered in blood, mud etc?

by kaalins
wombatidae

This older post on the subject may help a bit:

https://www.reddit.com/r/AskHistorians/comments/1ub8vu/how_would_medieval_fighterswarriorsmilitary/

Hergrim

/u/Henry_V_Rex answered this question during the Day of the Dead event earlier in the month.