@pizzaguy

There were actually many, the most well known besides Joan probably being Boadicea of the Iceni fighting the Romans.

http://www.lothene.org/others/women.html has a very long list by time period.

It brings up the point that there were many many laws through the ages prohibiting women from combat, and there would be no need for such laws if women did not participate in combat in the first place. Case in point: there is no law against setting your own genitals on fire because nobody does it, however there are laws against attempted suicide because people do.

An off-topic but interesting case in point in the news recently due to a grotesque event: there is no law against necrophilia in Wisconsin. A court decided that the "living or dead" clause in the rape laws only applies if the victim was killed during the assault.