Wielding longswords and halberds, more than 750 fighters from 34 countries have descended upon the Czech Republic to compete in the Battle of the Nations on May 6. The medieval-fighting competition, which takes place over five days in Prague, pits national teams against each other in a number of categories, including women's 3 on 3. Blades are blunted as a precaution, but the fighting is full-contact and brutal -- as one would expect to see on a medieval battlefield.