This video has some nice techniques for modeling a Japanese style wall for your Samurai games.
samurai
Seven Samurai Skirmish
Seven Samurai Skirmish is a set of free wargames rules for battles in the spirit of the classic Kurosawa movieĀ Seven Samurai.
Test of Honour Samurai Rules
Warlord Games offers a free pdf of their Samurai game, Test of Honour.
Japanese Clan Wars Rules
An Honorable Victory is a set of free wargames rules for battles set in Japan’s 15th and 16th century clan wars. The author writes:
An Honourable Victory! are an abstract (but not too abstract) set of rules designed for the table-top wargaming of the Clan Wars of Japan during the 15th and 16th centuries.
After one or two games you’ll have them down pat.