During the war, your fleets will engage enemy forces stationed in the same sea region via the Battle Generator System. This system generates missions by evaluating several strategic factors, influenced by the composition of the fleet, the operational range of the ship and naval technologies. In those generated missions, which range from small convoys raids to large fleet actions, you can take part and directly control your ships against the enemy.
This is written for the campaign missions ... I don't know if I understand what you mean because I use a translator, however it seems far from your idea of pre-established missions that you fight, and that their outcome (positive or negative) unlocks or no other battles which are also pre-established, in UAD from what I understand there will be this system that generates TOTALLY RANDOM and not pre-established missions.