Colonel Marcus Barton commands the Second Regiment of McCarron's Armored Cavalry, also known as Barton's Regiment, and he is a man obsessed. He has waited forty years to avenge his father's dishonor at the hands of Lester J. Otto. He blew his first chance, but he swears he will not make another mistake. He knows he has a second chance on Marlette, and Marcus Barton will have his revenge this time or die trying. And either way he plans to take his regiment with him...

McCarron's Armored Cavalry is a BattleTech scenario pack with includes the unit's history, prominent members, and special equipment. The scenarios chronicle the campaign known as "Otto's Last Stand," and can be used individually or as a campaign culminating in one of three different endings. "Otto's Last Stand" features deadly installations and point-based system for customizing the defending forces, so that the scenarios can be fought more than once and never be the same game twice.