I'm trying to find the exact ratio of attacking to defending troops, and I found some conflicting stuff.
The About page for the site says this:

Luck-free: By default, Warzone games are determined entirely by your skill. There is no randomness of the dice like in Risk.

But then, the wiki page for Combat Basics says:

Each army that attacks has a 60% chance at killing one defending army... The calculations on this page assume that the game's luck modifier is set to 100%.

Some of the stuff on the discussion page for it makes it seem like this is more from the WarLight era, so I'm just wondering if anyone knows how the actual ratio works now.
Thanks!

The games with a horseshoe icon have a luck modifier like the wiki described, but most games do not.
If you open the game menu (in any active game) you can go to the analyze attack option and see there for yourself how attacks, and without luck also the defends are shown, will go about.

note: each of these stats can be changed if the creator of a game choses to do so.

Most games use the luck free setting. In the settings you can see the attack and defense kill rates, it will also show what is considered the default rate.

This is adjustable in the settings and some templates will use luck modified settings. One tip is in the game to look at the attack/defend calculator (very useful for this question) - this is game specific and will show you the rate for that specific game. If luck is enabled that rate will show a graph of probabilities. Also when making an attack it normally says how many it will kill - if luck is enabled then it won’t say that as it can vary

Standard attack rate is 60%. 2 kills 1, 3-2, 5-3, 6-4, 8-5, 10-6, 11-7, 13-8, 15-9, 16-10

panieri and Nmind answer your question, but I also want to point out that you're right to be confused -- the wiki and documentation is very poorly organized and, in fact, this is the exact thing I'm working at improving right now.

Awesome, thanks for the quick replies everyone, and thanks for your work Fizzer!

It depends on the luck % and rounding mode.

With 0% and straight round (SR), it is rounded to the nearest natural number. Weighted random (WR) means that for example if attack of 6 with standard killrate 60% is calculated to kill 3,6 (Attackers * Killrate), then there is 60% chance to kill 4, and 40% to kill 3.

The difficult part starts when luck is different than 0%, because then the attack is killing different number than simply Attackers * Killrate.

One example that comes to mind, on old ladder settings (16% WR, 60% offensive killrate) there was a small chance that 5vs3 attack failed (killed only 2), or 5vs4 worked (both around 6-7%).
I will now show the calculations, just to ilustrate how it is too complicated to bother doing on your own with more than 0% luck.

With 100% luck, each army has 60% chance of killing 1. If you attack with 5, here is what chance you will have to kill:

0 defenders- 0,4^5 = 0,01024 (chance)
1 defender - 0,4^4*0,6^1*5 = 0,0768
2 defenders- 0,4^3*0,6^2*10 = 0,2304
3 defenders- 0,4^2*0,6^3*10 = 0,3456
4 defenders- 0,4^1*0,6^4*5 = 0,2592
5 defenders- 0,6^5 = 0,07776

With 16% luck, it means that 84% of the attack is like with luck 0% , and we add 16% of the above. With 5 attackers 5*0,6=3

0,01024 chance to kill: 84%*3 + 16%*0 = 2,52
0,0768 chance to kill: 84%*3 + 16%*1 = 2,68
0,2304 chance to kill: 84%*3 + 16%*2 = 2,84
0,3456 chance to kill: 84%*3 + 16%*3 = 3
0,2592 chance to kill: 84%*3 + 16%*4 = 3,16
0,07776 chance to kill: 84%*3 + 16%*5 = 3,32

Now with all that, If this was 16% SR, you would always kill 3, since it will round up even the lowest value 2,52 and 3,32 down to 3.

With 16% WR, you get the following:

Chance to kill only 2:

0,01024*(3-2,52) + 0,0768*(3-2,68) + 0,2304*(3-2,84) = 0,01024*0,48 + 0,0768*0,32 + 0,2304*0,16 = 0,06635

Chance to kill 4:

0,2592*(3,16-3) + 0,07776*(3,32-3) = 0,2592*0,16 + 0,07776*0,32 = 0,06635

So you get around 6,635% chance to kill 2, and same chance to kill 4.

Edited 2025-12-10 18:48:42

The vast majority of games are played on 0% luck SR and the game will tell you exactly how many armies you will kill. The big thing to know here is that there are “good” numbers to attack with (1, 6, 11, 16, 21, etc.) and “bad” numbers to attack with (4, 9, 14, 19, etc.) due to how rounding works.

If you’re playing with luck, it will usually be 16% so that 3 always kills 2.

If you’re playing with WR, the math is trivial to do in your head. 3 attackers * 0.6 attack rate = 1.8 killed units, therefore it’s a 20% chance to kill 1 and a 80% chance to kill 2.

If you’re playing WR + luck, as Widzisz shows, the math is crazy. Send an angry message to the template creator and move on with your life.