Guido Norman Lieber, a U.S. Army brigadier general who retired as Judge Advocate General in 1901, headed the Judge Advocate General’s Department for 16 years. His tenure in that role remains the longest in Army history. BG Lieber is best known as the author of a number of influential treatises on military law, including The Use of the Army in Aid of the Civil Power (1898) and Remarks on the Army Regulations (1898). He also worked to ensure the continuing influence of the code that his father, Dr. Francis Lieber, wrote in 1863 for Lincoln and the Union Army on the rules of conduct in war. As the Spanish-American War began in 1898, BG Lieber published and distributed a pocket edition of that 1863 code, General Orders No. 100. More. . .