"Brother against brother" is a slogan used in histories of the American Civil War, describing the predicament faced in families (primarily, but not exclusively, residents of border states) in which their loyalties and military service were divided between the Union and the Confederacy. There are a number of stories of brothers fighting in the same battles on opposite sides, or even of brothers killing brothers over the issues. The term Brother Against Brother is also the name of a popular rules set for miniature wargaming recreations of Civil War skirmishes.