The Red Devils are a unit of Samurai Cavalry with an additional +1 S and Frenzy. Naomasa must set up with this unit and may not leave it.
If Sanada Naomasa is taken, then you must include a unit of Samurai Cavalry in the army, chosen at additional cost from the Core Units section of the army list. This unit must be
upgraded to Red Devils at a cost of 3 points per model and given spears. They may not take a Clan Mon.