Lots of people like to cannon defense including me. There are a few things you nned for cannon defense, 1- You need to max shoot skill on cannon. 2- Max rapid reload. And when you get past wave 10 with the harder ships you might want to use cold shot. Make sure you are cannon defense with a full crew. If one of them has to go always have a back up person. with these few steps you will make it to high waves. And many want the Revant ram for unlimited fury, It is mostly founded in the waves threw 50 to 70. I hope this helps you in the future. Leaves comments and ways you think will help people.