This chapter examines whether postal workers are 'militant' to consider what they say about themselves. It develops these and judges postal workers' behaviour. The chapter assesses how postal workers see themselves before looking at commentators' assessments, and examines evidence of militancy historically before considering militancy's limitations generally and specifically with regard to postal workers. It considers relationship with union strength and workplace unionism. The chapter documents what postal workers say about themselves, different sections of postal workers and how they may have changed over time. The fact that Communication Workers' Union (CWU) members have taken more unofficial action that all of the TUC's other affiliates put together in the 1990s doesn't stem from beine a militant union but that circumstances are chansine. Militancy is the highest form of worker or union power, the limitations or weaknesses of militancy, primarily expressed through strikes, need consideration.