Quoted in "The Longest Winter" - Page 71 - by Alex Kershaw - History - 2004.
“As long as the enemy fights he must be beaten relentlessly, but a defeated enemy and especially the civilian population must be treated generously.”
Yesterday and Today, 1917-1967: Contemporaries Report on the Progress of German Soviet Friendship - Page 105 - by Verlag Zeit im Bild - Soviet Union - 1967.
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Alexander Suvorov 24
Russian military commander 1730–1800Related quotes

Source: https://www.youtube.com/watch?v=xiLR4sCgvnc
Context: But now, let’s give each other a chance.
It’s time to put away the harsh rhetoric.
To lower the temperature.
To see each other again.
To listen to each other again.
To make progress, we must stop treating our opponents as our enemy.
We are not enemies. We are Americans.

Source: "As I Please," Tribune, (24 December 1943)

1950s, Loving Your Enemies (Christmas 1957)
Context: Third we must not seek to defeat or humiliate the enemy but to win his friendship and understanding. At times we are able to humiliate our worst enemy. Inevitably, his weak moments come and we are able to thrust in his side the spear of defeat. But this we must not do. Every word and deed must contribute to an understanding with the enemy and release those vast reservoirs of goodwill which have been blocked by impenetrable walls of hate.

1950s, Loving Your Enemies (November 1957)
Context: Another way that you love your enemy is this: When the opportunity presents itself for you to defeat your enemy, that is the time which you must not do it. There will come a time, in many instances, when the person who hates you most, the person who has misused you most, the person who has gossiped about you most, the person who has spread false rumors about you most, there will come a time when you will have an opportunity to defeat that person. It might be in terms of a recommendation for a job; it might be in terms of helping that person to make some move in life. That’s the time you must not do it.

“To fight an enemy properly, you have to know what they are. Ignorance is defeat.”
Source: Short fiction, Hardfought (1983), p. 54

Jasper Ridley, Tito: A Biography (Constable and Company Ltd., 1994), p. 323.
Other

Go Rin No Sho (1645), The Fire Book

2005 February 17 - In a debate with DNC Chairman Howard Dean at Pacific University