Assertion: caliphate's army | /r/CapableOf | defeat larger persian force
Facets:
value: in 637
type: TEMPORAL
Source sentences:
text: In 637, a Muslim army under the Caliph Umar ibn al-Khattāb defeated a larger Persian force led by General Rostam Farrokhzad at the plains of al-Qādisiyyah, and then advanced on Ctesiphon, which fell after a prolonged siege.