How many Civil War battles took place in the North?

Although over 10,500 military engagements occurred during the Civil War, it is generally accepted that there were 50 major battles of the Civil War, with about 100 other significant battles. The battles were fought in three theaters; the Eastern Theater, the Western Theater, and the Trans-Mississippi Theater.

Explanation:

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.