The movie is in english & colour, i think it came out sometime between the 90’s & early 2000’s since i saw it round middle 2000’s being replayed on TV.Boy 1 is the leader of one side, girl 1 is his younger sister they live in or near a forest where they fight against the other side whose leader (i believe) is boy 2. I think the two sides live on separate sides of a river and it is implied their parents participated in the same rivalry when they were kids. Anyway girl 1 & boy 2 someway or the the become friends ( i think it’s because he saves her from getting hit with something that was being fired at her from one of his teammates, i believe they fight with slingshots, paint filled balloon, etc) & i think they develop feelings for eachother. One day boy 1 captures members from the other side including boy 2, takes them back to his sides clubhouse & proceeds to cover them with leeches for the amusement of his teammates however girl 1 & the rest of the girls are horrified so she tries to get her brother to stop but he refuses so she & the rest of the girls leave & seeing his sister upset takes the leeches off though he & some of the other boys get on with her afterward for making them stop (i’m not sure if she helps boy 2 escape or if they let them go). I think near the end of the movie she goes to meet boy 2 late at night but boy 1 & his friends follow her & when they see the meeting proceed to attack boy 2 & call girl 1 a traitor.