So much for the laws of arms

The Chronicle of the Good Duke reporting on the English siege of Nantes, 1380-1:

And some of those in the [French] garrison were wounded but none of them died and none was taken except Robert Guy of Riom and when he was disarmed the English were bemoaning their loss and did not put a guard on him so Robert Guy left them and went to the ditches where he rejoined the companions who began to laugh about it. And the English were very discomfited by the deaths of their barons and their loss of their people in skirmishes so they did not know what to do. Things went from bad to worse as they caught dysentery.