Ivey, a fitness trainer in Atlanta, will use all 60 pounds of the equipment Thursday at an outdoor arena in Aigues-Mortes, in the south of France. He will compete in his first Battle of the Nations, a modern-day, medieval-like combat involving national teams of fighters.“Everybody thinks I’m a little crazy,” Ivey said, without refuting the perception. ...Full-contact armored fighting events grew out of participation in historical re-enactments, which are largely theatrical and tame. More common re-enactment fighting involves wooden weapons in the United States. The Battle of the Nations, in its fourth year, is the first international full-contact competition of this scale that uses steel armor — a heightened risk factor that has attracted a certain breed of fighters. It has been won by Russia every year.