Kautilya's Arthashastra 13.4.22

13.4.22

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When a fort can be captured by other means, no attempt should be made to set fire to it; for fire cannot be trusted; it not only offends gods, but also destroys the people, grains, cattle, gold, raw materials and the like. Also the acquisition of a fort with its property all destroyed is a source of further loss. Such is the aspect of a siege.