The Eastern Crisis is a nonwar case that occurs during the heyday of the Concert of Europe. Nevertheless, the major powers avoided war with one another not because of the Concert’s deliberations, but rather because of domestic politics within France. King Louis-Philippe reined in his hard-line prime minster, Thiers, thereby removing the threat of war. This indicates that domestic politics is more important than system structure, at least in this case. One major lesson we can derive from this case is that “someone must stand for peace” – that is, one way for actors to avoid war is for a strong leader to rein in domestic hard-liners.