The 1st Regiment Alabama Siege Artillery (African Descent) was an artillery regiment recruited from African-Americans that served in the Union Army during the American Civil War. The regiment was renamed the 6th US Colored Heavy Artillery. Under the leadership of Major Lionel Booth, the 6th US Colored Heavy Artillery fought at the Battle of Fort Pillow on April 12, 1864. The regiment had a strength of 8 Officers and 213 men.