One of the most talented successor generals (Diadochi) was Antigonus Monophthalmus, so called because of an eye he lost in a siege. After the First War of the Diadochi in 321 BC, the second partition of the Empire took place, the Partition of Triparadisus; Antipater became the new regent of the empire and Antigonus strategos of Asia (charged him with hunting down and defeating the remnants of the Perdiccan faction). Antigonus took command of the Royal Army and after being reinforced with more reliable troops from Antipater's European army he marched against their enemies in Asia Minor.[5] In 319 BC he first marched into Cappadocia against Eumenes whom he defeated at the Battle of Orkynia.