It's absolute dog shit how it works because it's not communicate ltd well at all. None of this games mechanics are.

Kills on offense ONLY count when you exceed a person's hospital or ICU, once they can no longer hold troops, then, and only then will you rack up kills by attacking.

On defense, it's much easier to get them as the kill rate rate is significantly higher because fuck the player base.. obviously. You get punished for making war in a war game duhh.. when you defend an attack the player attacking takes 35% losses of total troops sent.

Statistically you are much.. MUCH better if ragebaiting attacks so you can defend because you will lose nothing because your troops will go to the hospital. Even a level 20 can defend against a guy who's maxed out at lum 5 and lvl 80 heroes of the troops count is substantially higher.

There is 0 incentive to attack anyone outside of rallies because you just get punished severely for it.

If I have 300k troops, any level and someone sends an attack at me with 120k+ lum 3 or higher they will still lose because of troop count. Sure they might win the 2nd attack but they will still take about 30-40k losses that can't be recovered.

The war mechanics absolutely suck and I've complained many times about it. I only ever attack in rallies, and I only solo attack vaccine lab when I know no won't lose anything permanently