This article argues that liberalism's failure to address systematicall
y the question of citizens' obligation to military service is indicati
ve of its wider failure to develop a satisfactory concept of citizensh
ip. Whilst liberalism's individualist bias, implicit class assumptions
and hope of transcending war have all contributed to neglect of citiz
en duty to bear arms, the most interesting reason, in relation to cont
emporary republican critiques, is liberalism's inadequate view of citi
zenship. This article examines the different approaches of the classic
al English liberals Locke, Bentham and J. S. Mill to international rel
ations, forms of national defence and the role (if any) of citizens, a
nd considers very briefly the views of some contemporary liberal theor
ists on military service and justified resistance to the draft. Finall
y, it comments on the implicit reliance of liberal polities on non-lib
eral models of citizenship, and the need for a coherent liberal concep
t of citizenship which includes an examination of responsibility for d
efence.