As he stays in the vicinity of the battle, why does Henry hope that his army is defeated?

Hery felt that if they were defeated in battle, he would be able to blend into the scattered troops as they retreated from the battlefield.

From the text:

He told himself that, despite his unprecedented suffering, he had never lost his greed for a victory, yet, he said, in a half-apologetic manner to his conscience, he could not but know that a defeat for the army this time might mean many favorable things for him. The blows of the enemy would splinter regiments into fragments. Thus, many men of courage, he considered, would be obliged to desert the colors and scurry like chickens. He would appear as one of them. They would be sullen brothers in distress, and he could then easily believe he had not run any farther or faster than they. And if he himself could believe in his virtuous perfection, he conceived that there would be small trouble in convincing all others.