In wars of liberty, attack of units keep changing from, time to time, battle to battle.
For example, if my units kill more of enemy's units then attack of all of my units is increased. But if my enemy kills more of my units then attack of my units drops. This effect continues even for new units I create. This effect continues until next 'fight'.
This occurs for all civilisations I choose. And this "morale effect" not only happens to me, but also to my enemy.
Example 1:
Full upgraded mahout should have around 70 attack, right? Wrong.
When he kills enemy's infantry his attack rises up to 120, some time even 150.
Example 2:
Full upgraded long swordsman should have around 90 attack, but his attack sometimes goes up to 149.
So attacks changing with time, is it intended. Is this "morale effect" intended? Or is it a bug?