“If a segment of one's force is located where it is not sufficiently busy with the enemy, or if the troops are on the march - that is, idle - while the enemy is fighting, then these forces are being managed uneconomically. In this sense they are being wasted, which is even worse than using them inappropriately.”

Quoted in "The 900 Days: The Siege Of Leningrad" - Page 182 - by Harrison E. Salisbury - History - 2003

The Loom of Time (2016)

As quoted in It's A Lot Like Dancing… : An Aikido Journey (1993 by Terry Dobson Riki Moss, and Jan E. Watson - 9781883319021}}

Some Hope, Chapter 1

With the century, vol. 5

Source: Here Lies Arthur

As quoted in “For Utopia, Curb State Controls”, Peggy Baker, Ames Daily Tribune (Ames, Iowa), January 23, 1970

In Shelter (May 1932), 2 No. 4, 36, and (Nov 1932) No. 5, 108. Cited in Richard Buckminster Fuller, Joachim Krausse (ed.) and Claude Lichtenstein (ed.), Your Private Sky: Discourse (2001), 17; sometimes quoted or paraphrased as "Don't oppose forces, use them."
1920s–1950s

Riyadh us Saleheen, as quoted in Muhammad As a Military Leader, Afzalur Rahman
Sunni Hadith