How to effectively use quick battles (autobattles)?

Can anyone provide a specific, real-world example, preferably with a save file, of how Quick Combat helps reduce losses when fighting ranged armies?
I've read this entire thread and the one on the forum, but I haven't found a good example.
On the forum, there was an example from Gunnar with upgraded elves, but I didn't find anything unusual there...

P.S. I investigated what happens in Quick Combat during a battle with the first Hydra in the Hive against 5 x 12 Vipers. In the first round, all the flies attack the Hydra, just like in a normal battle, but in all subsequent rounds, the flies don't make a single attack on the Hydras (probably due to the Hydra's ability to attack everything around it). The same thing happens in a battle of 2 Hydras in one stack against a Hive of 5 x 18 Vipers. In the first round, the flies kill 1 Hydra, and then they again "don't dare" to attack it and don't attack the Hydras at all.