In Okami what are you supposed to do when you are past the owls in the ice place and you come across a bunch of cannons you have to shoot off and there is one that shoots at you on another cliff

Use veil of mist to slow down time and then use power slash on the cannon balls to destroy the cannons. After they are out of the way draw a line from the ice pillars to the gap to create a pathway for you to cross.