The conquering or destruction of a city, town, or village because of that urban population’s refusal to surrender. This refusal renders the attacking army into a state of intolerance, rage, and desire to kill everything, rape anyone, and burn what ever is left. Usually, in that order.
You refuse to surrender then we shall sack you! I wave my genitals at your aunties! Last one to sack the city has to rape the horses and ride off on the women! Make sure to kill all the men! Then kill their best friends. Then kill anyone who thinks they might know them! And then they will be sacked!