Since the end of the Cold War, the overwhelming majority of negotiated peace settlements have been premised on the establishment of competitive, multiparty politics. The success of such settlements depends in turn on the degree to which the warring parties can make the adjustment from battlefield to political arena. This article addresses the question of how armed opposition groups are transformed into functional civilian political parties in the aftermath of civil conflict. It argues that the character and degree of commitment such parties make to the post-war political settlement depends on the kinds of challenges that adaptation to the settlement presents for them, as organizations. This article examines the cases of the Kosovo Liberation Army, the Croatian Democratic Union, and the Serbian Democratic Party in Bosnia and Herzegovina, and Renamo (Mozambique National Resistance Movement) in Mozambique.