Almost immediately after Byleth and Caspar had celebrated their marriage in style, the battle against those who slither in the dark began in earnest. As the new Minister of Military Affairs, Caspar worked with Byleth to command the Imperial army and bring peace to Fodlan. His impulsive bravery, tempered by his spouse's more level head, proved instrumental to victory in a great many battles. Their troops became known most of all for their ability to laugh in the face of danger.