“I mention this because, for a long time, the Government for excellent reasons has preferred the world to think that we still held some scruples and attacked only what the humanitarians are pleased to call Military Targets.... I can assure you, Gentlemen, that we tolerate no scruples.”
November 1941 https://books.google.ca/books?id=eEcXfXoSdgwC&pg=PR223, according to page 223 of "The Bombing War: Europe, 1939-1945", a 2013 book by Richard Overy
2014 Washington Post article https://www.washingtonpost.com/opinions/the-bombers-and-the-bombed-allied-air-war-over-europe-1940-1945-by-richard-overy/2014/03/07/7c2ba5de-9d60-11e3-a050-dc3322a94fa7_story.html refers to him as "a ranking British officer"
History Channel, between 5 November 2018 and 21 February 2019 https://web.archive.org/web/20190221193159/https://www.history.co.uk/shows/al-murray-why-does-everyone-hate-the-english/articles/the-bombing-of-german-cities-during-ww2, referred to him as "one bigwig at Bomber Command" when quoting this.
since at least 19 October 2017 https://steamcommunity.com/app/537800/discussions/0/3182216552766807678/ this quote has been misattributed to Charles Portal the "Chief of Air Staff", due to subsequent mention of Peirse's title "Chief of Bomber Command" mentioned in a 2015 Telegraph article https://www.telegraph.co.uk/history/world-war-two/11410633/Dresden-was-a-civilian-town-with-no-military-significance.-Why-did-we-burn-its-people.html following a paragraph naming Portal without mentioning the subsequent person was Peirse, allowing the assumption that it was continued discussion of Portal.
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Richard Peirse 1
Royal Air Force air marshal 1892–1970Related quotes

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Horses, bayonets, and battleships
Prachi
Gupta
Salon
http://www.salon.com/2012/10/23/horses_bayonets_and_battleships/
2012-10-24
2012