Is there a rise in female aggression and violence or are we just hearing about it more? I think women being violent to others has been hidden in the past because it was a class issue, the treatment of servants by thier female employers often left a lot to be desired, I think women have policed the behaviour of other women quite effectively, brothel madams have used violence to keep order, there have been female pirates. Historically there have been women on battlefields, from Boudicca, to shield maidens to resistance fighters in occupied France, often they've not been noticed because they've not been "found out", but they are documented at all times in history, nobody really knows how many women have fought as soldiers because its never really been documented. There have always been exceptions such as Jean D'Arc who everyone got to hear about, but how many others like her have there been? On a personal level, I can't see a hockey stick without memories of seriously bruised ankles, girls at my school and other schools were frequently getting in fights, my Mum remembers the same at her school.