Class B battles had a direct and decisive influence on their campaign. Class C battles had an observable influence on the outcome of their campaign. And Class D battles had a limited influence on the outcome of their campaign or operation but achieved or affected important local objectives. If a battlefield extends into several political jurisdictions, each is listed. A Compilation of the Official Records of the Union and Confederate Armies .
Some summaries indicate a specific number of troops.
Few casualty figures are definitive, and historical sources often differ in their totals. Inconclusive outcomes are so described.