For those of you who don't know how to use the Q technique. Here is how it's done.

This is very useful in battle. First, Group your tanks then hold down the letter Q. DON'T RELEASE Q! Click once at the enemy unit  DONT RELEASE Q! and click in a small triangle. As long as you hold down "Q", you can keep your tanks moving and they will fire at your target.

You can also Q with Destroyers on water the same exact way.

1, Dont release Q
2. Fire at a target
3. keep the tanks moving.