One way is to tell the truth about him.

In this entire war nothing hit Germany so hard a blow as the publicity given to a certain remark about a scrap of paper.

But from the government the army would not tolerate any interference.

It said: "Do you want us to run this war or do you want to run it ?" Each army of the Allies treated its own government much as Walter Camp would treat the Yale faculty if it tried to tell him who should play right tackle.
As a result of the ban put upon the correspondents by the armies, the English and a few American newspapers, instead of sending into the field one accredited representative, gave their credentials to a dozen.
These men had no other credentials.

The letter each received stating that he represented a newspaper worked both ways.