I think watching Snelling to see if he is communicating with the Tories Loyalist on the outside would be in order. Miss-information could be spread by "accidentally" letting Snelling find out about the fifty Marines or whatever other subterfuge you would like the enemy to think.
Once war has been declared, and you're fooling yourself if you do not believe that to be the case by this point in the story, you are foolish to allow an enemy sympathizer to roam free in your midst. It's ugly but something has to be done about it. They need to on some level, take the fight to the enemy before the winter depletes their supplies and disease make further resistance less likely to succeed.
My only knock remains the price to material ratio. I read all five books since last Friday but I did enjoy them and I will get the rest. If the sentiment of the books wasn't lining up so well with my personal Libertarian beliefs I couldn't justify the price.