Question About Paladin Resurrection Skill
 

What does Paladin Resurrection Skill Level 3 do?

For example,

if I have 2 stacks,

10 Red Dragon, 10 Black Dragon,

3 Red Dragon and 3 Black Dragon die after combat,

the resurrection skill will revive either the 3 red dragon or 3 black dragon?

Is that how resurrection work?

It would revive your 3 black dragons.

But it would not count as no losses battle, if the black dragons were the only stack that suffered losses.