This is from Hew Strachan's European Armies and the Conduct of War. This passage is about the dichotomy between military technology in the eighteenth century on the one hand, which didn't really allow for total war, and the desires and objectives of military commanders on the other.
The desire to force the issue was reinforced by the economic pressures which demanded a short war. The means were not limited if they were consonant with the objectives. In these circumstances, the arguments of Grotius and Vattel for moderation in war's conduct held little sway. In 1704 Marlborough burnt farms in order to bring the Elector of Bavaria to terms. In 1760, at the siege of Breslau, the Austrians demanded its surrender or, they said, they would pluck the babies from their mothers' wombs. The Prussian commander replied, 'I am not pregnant, nor are my soldiers.'