He shaved his beard but allowed all else to grow, which resulted in fantastic whiskers connecting his hair to his mustache. The style, which he made famous, was originally named 'burnsides;' at some point the word was reversed to become the 'sideburns' we know today. Hon.

Burnside had a major impact on the Civil War. He conducted a successful campaign along the Carolina coast, with perhaps the first amphibious landings in the war. His triumphs there were the earliest significant Union victories in the Eastern Theater and he was promoted to major general.

side·​burns ˈsīd-ˌbərnz. : hair growing on the side of the face in front of the ears. Etymology. an altered form of burnsides "long whiskers at the side of the face," named for Ambrose Everett Burnside 1824–1881 American general. Word Origin.

Sideboards are the same as sideburns.