This chapter examines three subjects relating to the themes of authority and allegiances. The first section considers the qualities that Romans considered important for effective generalship, including calculated displays of courage and a reputation for good fortune, which astute generals could foster as a way of strengthening their authority and the morale of their men. The much-debated subject of pre-battle speeches is also discussed, with less familiar but highly relevant late Roman evidence brought to bear. The second section examines the strategies deployed for maintaining the obedience of soldiers and changing patterns of military mutiny over the course of Roman history, with a view to identifying factors which influenced its incidence. The third and final section addresses the subject of civil war: its incidence and impact, and the ways in which commanders sought to negotiate the strains that internal conflicts placed on soldiers’ loyalties.