Who said "The only true defeat is loss of will."?

This quote is attributed to Douglas Haig.

The only true defeat is loss of will. - Douglas Haig

"The only true defeat is loss of will."

Douglas Haig Perseverance

Military Field Marshal British 1861–1928

"I have not the smallest doubt that the credit of this war will eventually rest with the cavalry."

"The general who loses morale loses the battle."

"In any war, the morale of the troops is half the battle."

"Success in war depends upon the moral factor."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."