If my opponent attack my base in the first step and win and I have a build order after that attack, is it allowed to me to build new units?

And in which area I can put the new units. Is it allowed to put them in the area with my base and the enemy unit are?

If yes, start this a new battle, who is the attacker.

An other special terran question: When I mobilze my base and move it with a attack into a enemy area on the planet, do I can use the bunker cards, too.

Thanks.

You may built unit in a friendly or empty space on the planet, so if the enemy has conquered your base you may not built units on that base.

You can use Bunker cards each time you fight in your OWN base. There can be two possibilities, either you are attacked in your own base or you try to re-conquer your own base.

Thanks, Boromir.

But how is it, when I attack the other player on my planet and move my base with some marines in the enemy area. First is this allowed. Second can these marines use bunker technologie cards?

With the liftoff abilitie you are not allowed to move you base into a space controlled by enemy forces. You should see it like this you first move your base and than the marines. But say that the enemy forces have taken over your base and than you try to retake your base, than you are allowed to use the bunker technology cards.

If you end up in this situation and you still have build order, you can voluntarily destroy your own base and build a new one in a friendly area. Of course liftoff is better but you must execute Mobilize order, with Build oreder you can save your base, but it cost you 2 crystals.