 According to the Senate testimony of intelligence officer and double agent Dr. Paul Altendorf, who was undercover in Mexico City with the U.S. Military Intelligence Corps from 1917 through April 1919, Jahnke had schemed a Mexican attack on the United States.An army of 45,000 men, funded by Ambassador von Eckardt and trained by German reservists, would march against the U.S. in 1918 and "arouse the Negroes to civil war.