Take Cover

[Jack I]

According to what I read somewhere, it entirely deflects one attack. (only one cause it lasts 10 seconds) It's in this subsection, I'm almost certain it's in the part about "Open Fire!"

EDIT: Here it is, straight from Open Fire! (Battle Order) thread.

Originally Posted by MariaSeaMorgan85

I rarely waste skill points on passive skills. One thing I would do is the Take Cover command. It is been so helpful! Every time you are in the heat of battle and you see a huge load of cannon fire coming your way you hit that button and it blocks it. Sure it only blocks it once until it reloads, but sometimes one hit makes the difference between plunder and jail!