Endurance skill and valor were exaggeratingly attributed to whom?

This has to do with the youth or Henry feeling and feeding off the energy from his enemies,

"He began to exaggerate the endurance, the skill, and the valor of those who were coming. Himself reeling from exhaustion, he was astonished beyond measure at such persistency. They must be machines of steel. It was very gloomy struggling against such affairs, wound up perhaps to fight until sundown."