A man-sized target, within your first range increment, it's AC 3, and if you take a round to line up a shot against an inanimate object you get +5... I don't know if using them as target practice is useful, that probably depends on how secure you are in power, and maybe they have garbage Dex and aren't proficient with the weapon but have other skills to make up for it, but it definitely seems like a problem if your minions can't make that shot, it doesn't take a Menador archer.
Presumably the thing Peter actually cares about is whether his minions can hit a real human, though, which is AC 10 or higher. You can't fault people for missing that sometimes... I'm guessing that Peter has seen a lot of poorly trained soldiers, or soldiers who don't train with ranged weapons? Your soldiers should train with ranged weapons, even if that's not what they expect or hope to be doing most of the time. The Gray Maidens carry bows.
What's number fifty-seven?