The Turn at Uhud (625 CE)
Khalid ibn al-Walid was a Quraysh cavalry commander, not yet Muslim, at the Battle of Uhud. The Muslim army had nearly secured victory when the archers guarding the rear left their positions for war spoils. Khalid led his cavalry around the mountain to attack from behind — a tactical maneuver the Prophet had anticipated and warned against.
The result: 70 Muslims killed, including Hamza ibn ‘Abd al-Muttalib. The Prophet himself was wounded. It was the most significant setback the early Muslim community faced. Khalid’s tactical genius, directed against Islam, had worked.
Conversion and Reconciliation
Khalid converted in 629 CE (7 AH), traveling to Medina with ‘Amr ibn al-‘As and ‘Uthman ibn Talha. The Prophet welcomed him warmly: “How long have I been waiting for your Islam! I had hoped your intelligence would not lead you to anything but Islam.”
His first military action as a Muslim: commanding the rear of the Mu’ta expedition (8 AH) after the three appointed commanders fell in battle. He organized a fighting retreat that saved the army — an achievement the Prophet described prophetically from Medina before the army returned.
The Prophet’s Title: Sayf Allah
After Mu’ta, the Prophet gave him the title Sayf Allah al-Maslul (the Unsheathed Sword of Allah). He never lost a battle in his life as a Muslim — a record across more than 100 engagements, by some accounts.
After the Prophet’s death, Abu Bakr deployed him first in the ridda wars (suppressing Arabian tribes who left Islam or refused zakat after the Prophet’s death), then in Iraq, then — controversially — pulled him from Iraq to reinforce Syria against the Byzantines. His victory at Yarmouk (636 CE) opened Syria to Islam.
See also: Seerah Uhud, Seerah Conquest Mecca, Sahaba, Prophet Muhammad, Seerah Medina