Encounters with Military Units in a Feudal Japanese Setting

For large swathes of its history Japan was riven by internecine warfare, notably the periods of ‘feudal anarchy’ in the fifteenth and sixteenth centuries. During those years the feudal lords (Daimyo) kept large standing armies which were constantly on the move throughout the country. It stands to reason that adventurers traveling in such a setting would have a relatively high chance of stumbling across one or more military units. This is a system for generating random encounters with such units.

The results will generate encounters with units varying in size from 11 individuals to 10,000 soldiers. Larger armies will include scouts, usually mounted, so DMs should take their existence into consideration when such an encounter is rolled….

— Random Encounters with Military Units in a Feudal Japanese Setting – Monsters and Manuals