[douglas]

If the enemy has no units/ships/bases in space at the planet and your whole fleet is equipped with stealth armor, you can park the cloaked fleet over the planet without combat occuring, and if the enemy player can detect the fleet the planet will be blockaded.

Theoretically, fleet strategy is supposed to override ship strategy if the fleet's strategy is set to not break formation. This is a very bad idea if you plan on actually fighting a serious battle, however, and only works for the first combat turn with "don't get hurt" in my experience.