“The tragedy of modern war is that the young men die fighting each other - instead of their real enemies back home in the capitals.”
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Edward Abbey 146
American author and essayist 1927–1989Related quotes

Remarks by el-Sisi during a military conference (28 April 2013) http://www.youtube.com/watch?v=LC93fn9s3-c.
2013
Variant: Simply, all what we did is that we avoided the country a big crisis and a battle between Egyptians. Beware, instead of Egyptians fighting each other, no, you can fight us, and we protect all. how many would fight us? but Egyptians fighting each other would be a big war we couldn't have had the ability to deal with.

“Older men declare war. But it is youth that must fight and die.”
Speech in Chicago, Illinois to the 23rd Republican national convention (27 June 1944)
Context: Older men declare war. But it is youth that must fight and die. And it is youth who must inherit the tribulation, the sorrow and the triumphs that are the aftermath of war.

“I'm fed up to the ears with old men dreaming up wars for young men to die in.”
“Wars were not made by young men, he thought, yet they had to fight them.”
A Tradition of Victory, Cap 14 "The Toast is Victory!"

“The poor go to war, to fight and die for the delights, riches, and superfluities of others.”

“Men are at war with each other because each man is at war with himself.”
This is almost always attributed to US Ambassador Francis Meehan http://www.nndb.com/people/060/000121694/, though without citations, and only very rarely to Patton.
Misattributed

"The Truth about Primitive Life"
The Road to Revolution (2008)