New Books In National Security

Why do some armies fare better than others on the battlefield? In Divided Armies: Inequality and Battlefield Performance in Modern War (Princeton UP, 2020), Jason Lyall argues that a state's prewar treatment of ethnic groups within its population determine subsequent battlefield performance. Treating certain ethnic groups as second-class citizens, either by subjecting them to state-sanctioned discrimination or, worse, violence, undermines interethnic trust, fuels grievances, and leads victimized soldiers to subvert military authorities once war begins. The author tests this argument using Project Mars, a new dataset on conventional wars fought since 1800. Combining historical comparisons and statistical analysis, he also marshals evidence from nine wars, ranging from the Eastern Fronts of World Wars I and II to less familiar wars in Africa and Central Asia, to illustrate inequality's effects. Divided Armies was awarded the 2021 Peter Katzenstein Book Prize, the 2020 Joseph Lepgold Prize, and was named a "Best