Exploiting the civil war and selling information is just what I want the thieves guild to do. There needs to be quite a few impromptu thieving times, like shoving as much into a cart as you can and getting away.
Yes! Now is a time for profit! Loot the dead! Steal weapons, supplies, and military secrets from one side and sell them to the other. Sabotage one town's production, blame it on the war, and force its citizens to buy from you!