"Unfortunately, that is a very real possibility.  But, we can't know for sure until we figure out where they're coming from.  Which brings me back to your mission for today.  As I mentioned, we were able to divine a large group of them somewhere to the south.  We think it's somewhere within a quarter-mile of the spot on that map, although we haven't had any luck narrowing it down further.  There was, however, an old watchtower in that general area.  It's been abandoned for nearly a century, but that might be a good place to start searching."