I searched my database and could not locate any conclusive information on an LH or HL or LM Linthicum. My database has many individuals that would fit these initials. Was it your ancestor who was possibly LM or ML Linthicum of someone else? I could find no listing for an LH , HL or LM Linthicum that served in either the Union or Confederate Armies under those initials. I do have the following interesting story that might be able to shed some clued for your investigation. More specific the information of Edward Linthicum living in Georgetown. Dr. Daniel Anthony Linthicum was born in Nelson County, Kentucky on June 15, 1827. He received his academic education at the St. Louis University where he graduated with an M.D. Degree in 1848. He resided in McSain County, Kentucky. He practiced medicine in Kentucky until the outbreak of the Civil War. In 1861 he was appointed Surgeon for the 8th Kentucky regiment, Confederate States of America. In October 1861 he became Chief Surgeon in General Patrick Cleburne’s Division of Hardee's Corps, The Army of Tennessee. At the battle ofChickamauga, he was taken prisoner on or about March 04, 1862, and reported to the Union Military prison on May 02, 1862 in Indianapolis, Indiana. His uncle Edward Linthicum, living in Georgetown, in the District of Columbia,secured an exchange for him from President Abraham Lincoln.He returned to the Confederate Army and remained in the Service of the Confederate States until the surrender of General Joseph E. Johnson in North Carolina in 1865. His apparent last post of duty was at the Cleburne Hospital in Macon Georgia, where he officially surrendered on April 29, 1865. He took the oath of allegiance to the Untied States there on May 11, 1865. At the close of the war, he practice for two more years in Kentucky, then in 1867 moved to Helena, Arkansas and continued to practice medicine. He received and Honorary Degree from Washington University of Baltimore, Maryland in 1872.It is not known if Edward Linthicum owned a hardware store in Georgetown, but he must have been a man of wealth in order to have the political clout to secure a parole for Daniel A. Linthicum.Another interesting story is that Edward acquired his wealth from selling and supplying horses to the Union Army; all the while he was also supplying horses to the Confederate Army. Of course the Union Army did not know this.Edward was the son of John Linthicum and Priscilla McGruder.I have no date of birth for him or any other biographical information.