Battle of Pea Ridge
Battle of Pea Ridge or Elkhorn Tavern
This map of the Battle of Pea Ridge was originally published in Abraham Lincoln: A History, Vol. V, by John G. Nicolay and John Hay.
n.d.
Picturing the War Missouri military units (Union) Missouri military units (Confederate) Battle for Missouri, 1861-1865 -- Military History of Missouri and Kansas
Map
Internet Archive
https://archive.org/details/abrahamlincolnhi00nico_5
No known restrictions on publication.