panzer and artillery leader skill for eye covered ?

Leader skills raise the chance of a max attack. The max attack isnt higher than you can attack without the skill. It only raises the odd. And in comparising with other skills, like plain fighting or barrage, it aint worth it

so i dont need artillery leader on my artillery eye covered i did as Fritz Erich von Manstein said in Attention Elite Players: Choosing Generals, A Road To Hell .

No, you don't need artillery Leader. You can take Ace Forces or Street fighting (Street fighting for aliens conquest, ace forces for other needs), but not artillery leader

Here's for clarity's sake:

These are the stats for units with largest min-max damage difference (max-tech):

Commando: 27-43
Super tank: 35-55
Field artillery: 31-63
Battleship: 31-63

Let's take field artillery. His base damage varies from 31 to 63, with average 47 and range (max-min) 32.

Assuming that every base damage has the same trigger probability, the probability to trigger max damage without leader skill is 1/33 (3%).

Leader skills add 16% to this probability, making it 19% for field artillery. Now, let's see how much this 16% is actually worth of.

Let's say artillery leader triggered. What was the base damage before it triggered? No one knows. Could have been 43, 54, and etc. Whatever that was, now it changed to 63. In order to measure how much it increased, we compare the average and the max.

This is the average damage increase when leader skill triggers: 63-47=16.

But remember that the skill only triggers 16% of the time. So when we multiply 16 by 16%, we get: 2.56.

Yes. 2.56. That's how much leader skill increases your output on average for field artillery. That's going to be less for other units. Compaer this to other skills: (plain fighting +20) / (guerilla +8) / (explosives +32) / (artillery barrage +24), and you'll see how insignificant it is.