The fall of the crusader-controlled city of Acre to the Muslims in 1291 inspired many schemes for crusades to recover Jerusalem and its environs. One of these proposals is How to Defeat the Saracens, written around 1317 by William of Adam, a Dominican who traveled extensively in the eastern Mediterranean, Persia, and parts of India. The treatise, poorly known even among specialists, presents a five-pronged plan for retaking the Holy Land...