On March 18,1862 the 121st Regiment of the Tennessee Militia was formed in Madison County.
According to Wikipedia, “’Units of the Confederate States Army’ by Joseph H Crute, Jr. contains no history for this unit.” Not being a Civil War Buff, I can’t state with any certainty that mister Crute is an author of any authority, but I can state that having gone to several impressive looking web sites that purport to collect information on Confederate and Union armies that they all report variations of “No data available” on the exploits of the 121st.