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It was mentioned somewhere before, but I'll add that the "fight to the last" skill is very useful for hit-and-run tactics. I took 7 stacks of 2 units each, went invisible, and attacked. When the invisibility ended, a couple of stacks remained, and they still took a long time to kill, so I attacked again. The only problem is that it's difficult to acquire this skill.
Added 1 minute ago Zybr
Unnecessary units don't need to be deployed in battle.
I'm saying that sometimes it's necessary to replace them with single units.