Daimyo is a set of free wargames rules for samurai battles in 15mm.
From the website:
Daimyo is a set of wargames rules intended for use with 15mm scale wargames figures but can easily be used with other scales (although I for one won’t be painting any 6mm samurai!). The rules cover the period known as The Age of the Country at War or Sengoku-Jidai. This was a period when samurai armies became much more organised, the importance of the ashigaru infantryman was recognised and the increasing use of firearms altered samurai warfare forever. It was also an age that produced some great commanders such as Oda Nobunaga, Toyotomo Hideyoshi, Takeda Shingen, Uesugi Kenshin and Tokugawa Ieyasu to name but a few. And, in a period of continual warfare, there were hundreds of battles, some of them epic encounters like Nagashino, Sekigahara and Kawanakajima. It is my hope that Daimyo will capture some of the excitement of this colourful and unique period of history