What factors change the power of war?

How it works

• Attacker: total unit attack → tactic multiplier (×1.10 / ×0.90 / ×1.00) → alliance level multiplier → unit matchup multiplier.
• Defender: total defence of the home garrison → unit matchup multiplier → tactic and alliance multiplier → fortification is added; with an empty garrison the power is 0.
• Every alliance level above 1 adds +0.25% to attack and defence; at level 20 the maximum is +4.75%.
• Fortification = position bonus + Stone Wall level × (420 + garrison defence power × 0.025); fortification does not fight on its own and is ignored when the garrison is empty.
• The result is decided by comparing the two sides' total power; casualty rates are also derived from that power ratio.
• Casualty curve: the winning army loses 0–40% depending on the power ratio, the losing army 45–80% depending on the power gap; the losing army is never wiped out completely. In a plunder raid (in worlds with the new combat rules) the defender gets +5% power and both sides' losses are ×0.6.
• Casualties are distributed across all participating unit classes in proportion to their share of soldiers; in back-to-back attacks each battle sees the current garrison.

Step by step

1. The type and amount of unit form the defensive score with the basic attack; not every unit has the same role.
2. The chosen tactic changes the rate of attack, defense, or march in its own description.
3. Archer's Quarry, Horseman's Quarry, and Blacksmith's expertise contribute to the area of unit or power in which they are identified alone.
4. In the worlds open today the Khan's Army Chief only shortens troop training time by 10% on the Training Grounds duty; the City Garrison duty has no effect on city defense. In newly opened worlds City Garrison raises city defense by 10–19% depending on office level.
5. In defense, the wall, tower, main gate position, and timely reinforcements join the total defense account.
6. In attack, reconnaissance information does not directly strengthen the outcome; it reduces the risk of entering the wrong target.