Within 8 weeks after surgery, patients will receive 5 weeks of combination radiation therapy and cisplatin chemotherapy. Radiation and cisplatin will be given on Day 1 or day 2 of each week followed by 4 days of radiation alone. An additional dose of radiation, directed at the surface of the vagina, will be given either during the last week (Week 5) of treatment or after the radiation and cisplatin chemotherapy is finished.