I have seen my cats doing it with tomcats, when there was a kitten in the house, theirs or of any other mother of the clan they did not allowed any stray tomcats in the vicinity, they literally charged with all the ferocity that only a mother animal can muster up!
It was heart-warming to see a cat Tara doing that for her human family member, a child she grew up with, in this case she was not attacking a tom cat but a huge dog that was mauling the kid! Boy! you should see her charging! One head-ram and the dog took to its heels!