He does have some information

Castor leans forward. "It's not much, but I can tell you what every soldier knows. The bandits in this area are all one group - under that so-called She-Wolf - and though they're stable, they're not as large as you might think. Our estimates, based on the various reports we've received, are that there are about two dozen of them, all told. Not a huge ****, like I said. Still...you'll need allies with you if you're going to take them on. They're a well-armed group, and two dozen well-armed men is nothing to sneeze at."

You nod, thoughtfully. "Knowing their numbers is most helpful. Thank you. Is there anything else you can tell us?"

Castor frowns. "Nothing certain. And...what's not certain, I'm afraid I can't share. You don't want to act on uncertain information, in any case."

Your eyebrows rise slightly. So, there is more. The man's just not willing to share it. Well, doing so would probably get him severely disciplined. Perhaps it's best to leave it...or find a way to persuade him?