I would say that punishment was more or less fair. As there was a fight. Thou I do find that people who was punished was wrong ones. Girl did nothing as stand there (or blabbered something and got punished for that, so she must be the most guilty one), you just went on defending female, and that is noble, nothing to be blamed for and for sure you are not the one who started the fight. Other male must be the one who must get the longest suspension, but eh. World is not fair.....
I remember being kid and hitting other girl with sport shoes because she insulted me (harpy is quite aggressive, and when she was a kind she did not control her impulses, she did a lot of aggressive stuff back then). And this one time I accidentally hit out my classmates teeth with the end of broom while sweeping, but that was not my fault, the person stood behind me, I did not see him. And this other time I accidentally pushed a girl while playing and she got contused a bit, I think she had to put some stitchs on her ear, her mother even forbid her to play with me

But then again - I never got punished for these actions, just a note for hitting the girl with sport shoes and my mother ignored it.
We did not get suspended or anything back when I was in schools (pre uni), just a serious talk and note to parents. But then again - we never fought in school, we did it all after school