Search for a topic, individual keywords, a location, or place. Don't search for the "name" of the war or individual battle. The wars weren't "named" until later -- think about World War I -- it wasn't I until World War II occurred!
Some beginning search terms are below:
(battle or skirmish) AND location of battle
Battle at XX
*If you can limit by date -- try a few months around the date of the battle (after the date of...)
*Be sure to look at the dates and location of the newspaper coverage. If it is a local battle, it may or may not have had broad coverage during the time period -- so use the databases below that cover the time period.