Thanks for the reply.
Thanks again to @Krieghund too. :)
Example: i have naval units in a sea zone and move 2 spaces to attack.
Then i want to retreat, but the rules say that all naval units must retreat to a space from where at least one naval unit has come. Thia means that i retreat 2 spaces?
Only one space, from the direction one of your units came(your choice). And you can only retreat from a battle if the defender still has units. Not if you have sunk them all!