Rashi on II Samuel
You should have talked [peace] first. You should have talked peace first. If they had answered you that they wanted peace and had opened their city to you then you should not have gone to war against them.
Rashi on II Samuel
If you had asked [for peace] with Oveil. If your soldiers had asked for peace with this city called Oveil.
Rashi on II Samuel
They would have completely [cooperated]. The people of the city would have immediately made peace with you.