Gilles made no reply that can be written, for what letters can shape a Norman grunt?
Perhaps 'Wauch!' comes nearest.

They fought on horseback, with swords, from noon to sunset, and having hacked one another out of the similitude of men, there was nothing left them to do but swoon side by side on the sodden leaves.

In the morning Gaston, unclogging one eye, perceived that his enemy had gone.

'No matter,' said the spent hero to himself.

'I will wait till he comes back, and have at him again.' He waited an unconscionable time, a month in fact, during which he delighted to watch the shy oncoming of a Northern spring, so different from the sudden flooding of the South.