Wallach provides a pioneering study of coalition warfare. Using World War I as a case study, Wallach examines such important aspects as Allied pre-war planning; the particularistic interests of coalition partners; human relations; the framework for coordination mechanisms within coalitions; the application of such concepts as a general reserve, unified command, and amalgamation of forces; logistical problems; war finance; and the transition from war to peace.

In the process, Wallach shows that coalition warfare is among the most difficult forms to develop and maintain successfully....