Declaring war or seizing provinces from civilized countries without pre-existing claims makes diplomacy more difficult and can eventually lead to preemptive war from other powers.
Marshals primarily enforce orders from civil court cases, including collecting on judgments, towing, seizing utility meters and carrying out evictions.
Measures could involve charging orders on a property, deducting money from a person's salary, seizing assets such as vehicles, and even forcing them into bankruptcy.