The process of calculating the outcome of a battle is something like this. Ion Bombers and Ion Frigates reduce the defender's shields by 50% CROSS SHIELD EFFECT - the ability of shields to block attack power is only 99% for most units.COMMANDER LEVEL - the two commander types which are relevant are Tactical and Defense commanders.COMMAND CENTERS - these 'add 5% fleet attack power at base location' meaning battles fought at this base only.SHIELDS RESEARCH - the tech level of shields research, boosts the defender's shield value by 5% per level.

ARMOUR RESEARCH - the tech level of armour research, boosts the defender's armour value by 5% per level.WEAPONS RESEARCH - the technical level of the attacking ship's weapons, boosts weapon power by 5% per level.SHIELDS - the defending units, turrets or rings ability to deflect or block the attacker's power.ARMOUR - the ability of the defending units, turrets, or rings to absorb the attacker's power.POWER - this is the attack power of the ship(s).OTHER DEFENDERS - Turrets, Defensive Shields and Planetary Rings on this base.SHIP COUNTS - how many of each ship type is involved.SHIP TYPES - some ship types have almost no attack or defense abilities.The variables that are used in battle calculation are fairly clear.

Astro empires battle calc excel