The Battle of Yarmuk

Khalid sensed the Roman fatigue and their loss of morale. He organized his cavalry into one massive core then secretly in the night he sent troops to block or destroy all the bridges that would allow the Byzantine army to retreat. The battle of Yarmuk was Khalid ibn al-Walid's masterpiece. But a few years later in 638 he was dismissed of all command. And on his deathbed in 642 he was upset, upset that he hadn't died in battle.