“My heart is broken by the terrible loss I have sustained in my old friends and companions and my poor soldiers. Believe me, nothing except a battle lost can be half so melancholy as a battle won: the bravery of my troops hitherto saved me from the greater evil; but to win such a battle as this of Waterloo, at the expens of so many gallant friends, could only be termed a heavy misfortune but for the result to the public.”

Source: Changes

Siwardus, consul rigidissimus, pro fluuio uentris ductus mortem sensit imminere. Dixitque, "Quantus pudor me tot in bellis mori non potuisse, et uaccarum morti cum dedecore reseruarer! Induite me saltem lorica mea impenetrabili, precingite gladio. Sublimate galea. Scutum in leua. Securim auratam michi ponite in dextra, ut militum fortissimus modo militis moriar."
Dixerat, et ut dixerat armatus honorifice spiritum exalauit.
Book VI, §24, pp. 378-81.
Historia Anglorum (The History of the English People)

Source: The Fires of Heaven

As quoted in The New York Times (26 December 1886), and in Words on Wellington (1889) by Sir William Fraser, this is almost certainly apocryphal. The first attributions of such a remark to Wellington were in De l'Avenir politique de l'Angleterre (1856) by Charles de Montalembert, Ch. 10, where it is stated that on returning to Eton in old age he had said: "C'est ici qu'a été gagnée la bataille de Waterloo." This was afterwards quoted in Self-Help (1859) by Samuel Smiles as "It was there that the Battle of Waterloo was won!" Later in Memoirs of Eminent Etonians (2nd Edition, 1876) by Sir Edward Creasy, he is quoted as saying as he passed groups playing cricket on the playing-fields: "There grows the stuff that won Waterloo."
Elizabeth Longford in Wellington — The Years of the Sword (1969) states he "probably never said or thought anything of the kind" and Gerald Wellesley, 7th Duke of Wellington in a letter published in The Times in 1972 is quoted as stating: "During his old age Wellington is recorded to have visited Eton on two occasions only and it is unlikely that he came more often. … Wellington's career at Eton was short and inglorious and, unlike his elder brother, he had no particular affection for the place. … Quite apart from the fact that the authority for attributing the words to Wellington is of the flimsiest description, to anyone who knows his turn of phrase they ring entirely false."
Misattributed

1990s, Vibe magazine interview (June 1996)

[Solo success, S. Sahaya Ranjit, 25 April 2005, India Today, https://www.webcitation.org/query?url=http://indiatoday.intoday.in/story/pandit-ram-narayan-dedicates-padma-vibhushan-award/1/193919.html&date=2017-10-03, 3 October 2017, 3 October 2017]

Unverified, but reportedly said by Arnold on his deathbed in 1801, requesting to wear the uniform of the Colonial Army from before his defection to the British, as quoted in The Picturesque Hudson http://www.kellscraft.com/PicturesqueHudson/PicturesqueHudson08.html (1915) by Clifton Johnson

As quoted in "International Arbitration" by W. H. Dellenback in The Commencement Annual, University of Michigan (30 June 1892) and in A Half Century of International Problems: A Lawyer's Views (1954) by Frederic René Coudert, p. 180.
Context: Though I have been trained as a soldier, and participated in many battles, there never was a time when, in my opinion, some way could not be found to prevent the drawing of the sword. I look forward to an epoch when a court, recognized by all nations, will settle international differences, instead of keeping large standing armies as they do in Europe.

Source: Song Tear me down