Amazons and Gladiators (2001)

12-year-old Serena and her sister are taken as slaves by Julius Caesar's troops after their parents are brutally murdered by the foot soldiers of General Crassius. As her older sister is taken off to the Roman slave market, the young Serena swears revenge against the evil General and sets off on a solo quest to find Crassius. Serena's journey leads her to the gladiator fights, where she is shocked to learn that her sister is now Crassius' slave mistress. Serena must prove herself the ultimate Gladiator if she is to exact vengeance for her family.