Total War Encyclopaedia

In Rise of the Samurai junsatsushi are your secret policemen, recruited through the barter building chain. Junsatsushi ensure loyalty and obedience from friendly generals, increase income by preventing corruption, keep your castle towns and armies safe from enemy subterfuge when positioned inside them, and can request the allegiance of neutral and enemy castle towns, along with any forces garrisoned there. Junsatsushi can also pay off rival agents. They are vulnerable to indoctrination by enemy sou and are exceptionally dangerous to monomi.