Henry goes wandering about camp hooded and cloaked—effectively in disguise—to figure out not just the morale of his men, but more or less whether or not they feel his cause is a just one and therefore worth all the trouble and bloodshed that has occurred, and will occur, in the future. While his dialogue with Pistol is one held at length from each other, it's easy to let this mild facade slide. A modern audience might have a few more questions when it comes to the fact that, after drawing attention to himself in trying to pass unnoticed (and failing utterly), he sits down with several foot soldiers and no one seems to recognize his voice, or even the outline of his face. Hooded cloak aside, you'd think they'd recognize him and just play along or bow down immediately. But considering the poor capability of communications even in Shakespeare's time, to say nothing of the actual Henry V's, the scene still makes perfect sense; the soldiers present have only seen Henry on horseback, in full armor and regalia, and only heard his voice as he was screaming at the top of his lungs. In both Shakespearean and Medieval times, you were LUCKY if you ever even HEARD the monarch's real, "I'm talking normally now" voice, much less one held quietly in a military camp, and even MORE lucky if you even know what the monarch really looked like at face value up close. The only other possible modern nitpick is that Henry could walk about the camp hooded and cloaked without impediment, and is given allowance simply by being able to say who he's lead by in the army when asked, without being asked further questions or given due skepticism. This is historical accuracy of the time integrated into (relatively speaking) fiction of the time at work: back then, only a man in that army would be able to speak English that well, on demand and under pressure, and have such immediate knowledge of those in commanding positions at the same time. Hooded cloak or not, even creeping about in reality would have such a man more likely be a: a deserter, b: a thief wandering about camp for goods to snatch, or c: someone looking for a private place to "do business." Medieval armies were horribly insecure by modern standards, and this play shows it well.
