There were two types of war.
The first was a war between only those involved, where civilians were excluded as much as they possibly could be.
And the second was a war where the common people lost everything because the ones fighting didn't care about them in the slightest.
August always preferred to fight the first type of war. There was no such thing as a kingdom without people, so it was pointless to fight a war where they were slaughtered without remorse.
However, Raphael was different. Even if the people in the border city were real, he wouldn't have changed his strategy. He would've similarly destroyed everything so he could get rid of the enemies in that place.
Perhaps August didn't agree with this kind of warfare, but he was not the one in command of the armies at this point in time, so there was nothing he could do about it.
Just, he had to be careful about what he let Raphael do in the future.