“War is murder, king-sized.”

Source: The Flanders Panel

Source: Cosmos (1980), p. 326

Source: His Last Bow: 8 Stories

Variant translation: Unless a nation's citizens are in danger, war is a crime.
"Adana Çiftçileriyle Konuşma" (16 March 1923) http://www.atam.gov.tr/index.php?Page=SoylevDemecler&IcerikNo=155; English translation as delivered in an address by Talat S. Halman (10 November 1995) http://turkishembassy.com/II/O/AtaturksPage.htm, quoted in The Turkish Times (1 December 1995)

"Which was the Dream?" (1898)

House of Commons, 13 May 1901, Hansard vol. 93 col. 1572. http://hansard.millbanksystems.com/commons/1901/may/13/army-organisation
Early career years (1898–1929)
Context: In former days, when wars arose from individual causes, from the policy of a Minister or the passion of a King, when they were fought by small regular armies of professional soldiers, and when their course was retarded by the difficulties of communication and supply, and often suspended by the winter season, it was possible to limit the liabilities of the combatants. But now, when mighty populations are impelled on each other, each individual severally embittered and inflamed—when the resources of science and civilisation sweep away everything that might mitigate their fury, a European war can only end in the ruin of the vanquished and the scarcely less fatal commercial dislocation and exhaustion of the conquerors. Democracy is more vindictive than Cabinets. The wars of peoples will be more terrible than those of kings.

Numbers sanctify.
Monsieur Verdoux (1947); Chaplin in this line is quoting an older statement of Bishop Beilby Porteus: "One murder makes a villain. Millions a hero."