Khalid ibn al Walid

Who was also called "Sword of God", was a Muslim Arab military commander, some consider him as one of the greatest military commanders in history, as he was undefeated in over a hundred battles both major and minor battles. He consistently defeated Persian and Byzantine Armies despite being heavily outnumbered and outgunned.
He conquered both Syria and Iraq, the most prosperous provinces of the Sassanid Persian and Byzantine empires.

He expressed sadness as he did not die as a martyr in the battlefield in the following speech.

"I've fought in so many battles seeking martyrdom that there is no spot in my body left without a scar or a wound made by a spear or sword. And yet here I am, dying on my bed like an old camel. May the eyes of the cowards never rest."

— Khalid bin Al-Walid