Knight Wars is a cancelled real time strategy / action game for the Wii, that was in development in 2006/2007 by Kuju London (nowadays known as Headstrong Games). Except for being planned as a medieval version of the Battalion Wars games, there is not much known about the project, only that it was cancelled in 2007 when Nintendo decided to shift their resources to mass market-accessible titles such as Wii Fit or even the cancelled Wii Crush. As we can read in an old Gamespot article:
Our spies at Kuju’s HQ also tell us that another game based around the WARS series is also in development for the Wii called Knight Wars. Based in middle-aged England, players control tens of thousands of troops including units such as horses, magicians and Knights! ‘Its like Battalion Wars but with some great sword-swinging Wii action and riding around doing tasks for King Arthur!’ we were told!’
As you can read on the wayback machine there were 2 also unnamed Juku projects, one published by Ubisoft Entertainment S.A., and the other by Vivendi Universal Games.
Thanks to Rukku for the contribution!