20th Maine Infantry Regiment

20th Maine Infantry Regiment
Flag of the 20th Maine
Active	August 29, 1862 – July 16, 1865
Country	United States
Allegiance	Union/Federal/North
Branch	Infantry
Type	Regiment
Engagements	American Civil War Antietam Fredericksburg Chancellorsville Gettysburg Spotsylvania Court House Petersburg Five Forks Appomattox
Commanders
Notable commanders	BG. Adelbert Ames BG. Joshua Lawrence Chamberlain LTC. Ellis Spear

The 20th Maine Infantry Regiment was a volunteer regiment of the United States Army (Union Army) during the American Civil War (1861–1865), most famous for its defense of Little Round Top at the Battle of Gettysburg in Gettysburg, Pennsylvania, July 1–3, 1863. The 133rd Engineer Battalion of the Maine Army National Guard and the United States Army today carries on the lineage and traditions of the 20th Maine.