The attached column was published shortly after the war in order to let the Doughboys in on a secret group within the World War I American Army that was charged with the task of dumping propaganda leaflets onto the German trenches, an effort that they hoped would inspire their surrender:
"Propaganda is nothing but a fancy war name for publicity and who knows the publicity game better than the Yanks?"
The German language document pictured above was produced by British propagandists in the Spring of 1917; it tells of a large amount of American soldiers crossing the ocean to have at 'em, and so it would be best to quit now - or words to that effect.