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1 vote Vote for this answer. According to Dyer's Compendium, there were 10,455 military actions during the Civil War. Of these actions, 29 were identified as campaigns, 76 as battles, and 310 as engagements. The other 10,000 or so were considered minor actions such as skirmishes, reconnaissances, etc. The Civil War Sites Advisory Commission (appointed by Congress and by the Secretary of the Interior) identified 384 of these actions as the principal battles and classified [them] according to their historical significance..
If we focus on the most important engagements on the Civil War (categories A and B) then we are left 149 battles. From this number, we subtract six battles: five because they were primarily naval actions and one because it did not involve troops from the Confederate army (Sand Creek).