“Train hard, fight easy.”
The quote "Train hard, fight easy." is famous quote attributed to Alexander Suvorov (1730–1800), Russian military commander.
other version: Hard training - easy combat; easy training - hard combat.
Philip Longworth: The Art of Victory, New York, 1965, cited in af.mil http://www.airpower.maxwell.af.mil/airchronicles/aureview/1986/nov-dec/menning.html.
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Alexander Suvorov 24
Russian military commander 1730–1800Related quotes

Poem, "Liberty's old story" in Pansies (Third typing, ribbon copy - 231 poems, c. 11-28 February 1929)

“If you’re not falling, you’re not training hard enough.”
Interview by Nicki Gostin, Newsweek, Updated: 10:46 a.m. ET March 11, 2005 http://www.msnbc.msn.com/id/7151262/site/newsweek/

“Hard work and training. There's no secret formula. I lift heavy, work hard and aim to be the best.”
Herald Sun staff (October 13, 2006) "A good life, naturally", Herald Sun, p. 017.

Symbolism: Its Meaning and Effect (1927).
1920s

“I am fighting hard for peace.”
Remarks to George Riddell, as recorded in Riddell's diary (31 July 1914), quoted in J. M. McEwen (ed.), The Riddell Diaries 1908-1923 (1986), p. 85
Chancellor of the Exchequer
“I had to fight so hard not to cry.”
Source: By the Time You Read This, I'll Be Dead

The Daily Chronicle on the 7 March 1917 https://www.rte.ie/centuryireland/index.php/articles/george-bernard-shaw-joyriding-on-the-front.
1910s, The Technique of War (1917)