Talk:Tutorial: FAQ/@comment-24276158-20131218203900/@comment-24297359-20131219175001

Line abreast will increase your armor and evasion while greatly decrasing your fire power. You will use it only when you don't care about sinking enemy but to take as less damage as possible.

Line ahead, in the other hand, decrease your armor while increasing your fire power. This formation is the one you will go for in every boss fight. While using this formation, only a hit from enemy CL or even DD might take half of your ship HP.

Double line will increase your armor, evasion, and fire power a little. This formation is good when you are not sure whether you should go for defensive or offensive one.

On the node that you are confident that your fleet can easily take care of it, using line ahead is a great choice. Your fleet will, most of the time, get rid of the enemy fleet before they can attack you.