If engaged i na fight, they will remain until it is over. Once fighting is over over, or if not in a fight, the soldiers will then run to other units or retreat if no other unit is within R2. When the number of men per officer Samurai exceeds 20, excess men retreat to the rear. Ninja are used mainly to raid or ambush. They are of limited special use on the conventional Japanese battlefield, but since so many people like them, we added them to the rules.
Ninja can act alone or in small groups.
They do not need an officer. Musketeers usually fire as units, and are brigaded next to spearmen. After firing, musketeers reload while spearmen fend off any attackers. Like the fictional Fanrengi space profiteer, Quark, the daimyo's main goal is Acquisition. He wants lands and goods and power to enrich his little fiefdom.