[ConorMacNessa]

Whether Ludendorff or one of his aides ever said "These Marines fight like Devil-dogs" is of no consequence.

That they fought with grace, skill and professionalism for the United States of America, as they did, is of great consequence. The origin of the term "Teufelhunde" may well be a myth. The bravery, skill and patriotism of the U.S. Marine Corps at Belleau Wood and in countless battles thereafter is not.

"I am an American fighting man. I serve in the forces guarding our country and our way of life.
I am prepared to give my life in their defense."

[ansel12]

As no consequence, then there is no need to treat it as truthful.

Fake history doesn’t help anyone.