The lessons in Sun Tzu's book "The Art of War" still ring true, despite it being written in 513 B.C. Case in point comes from the tactics used during the Vietnam War. As the following video points out, you have American Gen. William Westmoreland, who sees the battlefield like a chessboard. Then you have Gen. Võ Nguyên Giáp — who sees it like Sun Tzu would — as a go board. In go, you acquire territory with the fewest resources instead of eliminating the enemy troops like in Chess.
"It's a classic case of a general fighting the last war," says Richard A. Gabriel, a professor at the Department of War Studies at the Royal Military College of Canada, in the video. "The lessons he learned there [Gen. Westmoreland during World War II] only apply partially to Vietnam. There were no fixed objectives to be taken, there were no fixed units to be destroyed."
This video shows how Sun Tzu's lessons were applied during the Vietnam War: