Umar fought in numerous battles during his military campaigns:
- Battle of Badr (624): Umar fought alongside the Prophet Muhammad in this battle against the Meccans. The Muslims were outnumbered but emerged victorious.
- Battle of Uhud (625): Umar was wounded in this battle, but the Muslims held their ground against the Meccans.
- Battle of the Trench (627): Umar played a key role in this battle, where the Muslims dug a trench to defend against the Meccans. The Meccans eventually withdrew.
- Battle of Yarmouk (636): Umar was the overall commander of the Muslim army in this battle against the Byzantine Romans. The Muslims won a decisive victory, opening up Syria and Egypt to Muslim conquest.
- Battle of Kadisiyyah (636): Umar's forces defeated the Sasanian Persians in this battle, leading to the conquest of Iraq.
- Battle of Nahavand (642): Umar's forces defeated the Sasanian Persians again in this battle, effectively ending their resistance and consolidating Muslim control over Persia.
These are just a few of the many battles in which Umar fought during his military campaigns. He was a skilled military strategist and leader, and his conquests played a crucial role in the expansion of the Rashidun Caliphate.