 Lieber was a member (Companion No.05226) of the Military Order of the Loyal Legion of the United States, the first post-Civil War veterans' organization, founded by and for men who had served as commissioned officers in the armed forces of the Union.His publications include several important treatises on the laws of war, such as "The Use of the Army in Aid of the Civil Power" (1898), and "Remarks on the Army Regulations" (1898).