This article draws out the contradictions in the liberal peace that have become apparent in post-Taliban state-building in Afghanistan. In particular, it focuses on how warlords have been incorporated into the government. The government has been unable to achieve a monopoly of violence and has relied on the support of some powerful militia commanders to secure itself. This raises a number of practical and ethical questions for the liberal peace. The focus of the article is on warlordism, rather than in providing detailed narrative accounts of particular warlords. The case illustrates the difficulty of extending the liberal peace in the context of an ongoing insurgency.