Translations for champion in French

Here are paragraphs from public domain books translated:
"Well, he did remain with them; and your Majesty has in him so firm a champion that it was he who gave Jussac the terrible sword thrust which has made the cardinal so angry." — En effet, il demeura avec eux, et Votre Majesté a là un si ferme champion, que ce fut lui qui donna à Jussac ce terrible coup d’épée qui met si fort en colère M. le cardinal.
The Three Musketeers, by Alexandre Dumas Les Trois Mousquetaires, de Alexandre Dumas