About 1.8M results
Maryland campaign - Wikipedia
Confederate Heartland Offensive - Wikipedia
New Mexico campaign - Wikipedia
Robert E. Lee's Decision to Invade the North in September 1862
Confederate Heartland Offensive, Campaign, Summary, History
Battle of Gettysburg: Summary, Facts & Casualties | HISTORY
Battle of Antietam | Summary & Significance | Britannica
The Maryland Campaign of 1862 - American Battlefield Trust
When Washington, D.C. Came Close to Being ... - Smithsonian Magazine
How the Battle of Gettysburg Turned the Tide of the Civil War