This work aims to analyse the play Serjeant Musgrave's Dance (1959) by John Arden. To accomplish this, a contextualization of the post-Second World war period is made and subsequently a summary of the theatre in this period which established a new moment especially after 1956. The study also covers how the Epic Theatre was consolidated in Britain in the 1950s. Finally, a brief biography of the playwright is stated, highlighting his most important plays. In a second moment, an analysis of the play by John Arden considering its main formal and thematic aspects such as the war, messianism and the possibility of political agency by the individuals is presented. In the third chapter, the dissertation draws a contrast between Arden's play and the play Mother Courage and Her Children (1939) by Bertolt Brecht. From a comparative perspective, the political potential of Brechtian Epic Theatre as it was constituted in Arden's work and in PostWar Britain Theatre is pointed out.