A story coming out of World War I indicates that the 91st Infantry Brigade of the U.S. Expeditionary Army was preparing to enter combat in Europe.
(Photo is from WWI, but not those soldiers)
Most of the men were “green soldiers” who had never seen combat. Its commander, a devout Christian, called an assembly of his men where he gave each a little card on which was printed the 91st Psalm. They agreed to recite it daily and it became known as the “Soldier’s Psalm”.
The 91st Brigade was engaged in three of the bloodiest battles of WWI: Chateau-Thierry, Belle Wood, and the Argonne. While other American units similarly engaged had up to 90% casualties, the 91st Brigade DID NOT SUFFER A SINGLE COMBAT RELATED CASUALTY!