Colonel (Ret.) Douglas Macgregor, U.S. Army, is a decorated combat veteran, and the author of five books. His latest book is Margin of Victory: Five Battles that Changed the Face of Modern War.
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Douglas Macgregor
MISNK, BELARUS - FEBRUARY 11: (L to R) Ukrainian President Pyotr Poroshenko, Belarus President Alexander Lukashenko, Russian President Vladimir Putin during peace talks over Eastern Ukraine on February 11, 2015 in Minsk, Belarus. The European leaders are meeting to discuss a cease-fire in the Ukraine. (Photo by Dmitry Azarov/Kommersant Photo via Getty Images).