Only applies to infantry, and is their ability to “push” back other units.
#Total war shogun 2 black ship full
The biggest trick is actually catching it and forcing it to fight as it runs away from a full stack. Having more sengoku bunes will increase the chance of getting it. It's possible to get it early game if you have 2 sengoku bunes 4 medium bunes and a couple bow kaboyas. Got it on every of my legendary plays (3 so far).