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  • TheBattleofBadr, page : 41

As the believers searched for their martyred companions among the dead they
noticed unusual burn marks on the necks and joints of the slain unbelievers.

When they mentioned this to the Prophet, he told his companions that when
Allah commanded the angels to slay the unbelievers they did not know how to kill
human beings so they asked Him how they should be slain. Allah told them to
smite the unbelievers with their swords upon their necks and joints and so the
burn marks of which they spoke were the marks left by the swords of the angels.

Later, the Prophet, praise and peace be upon him, spoke of the winds that had
accompanied them, telling his companions that the first had been brought by
Angel Gabriel together with a thousand angels. The second by Angel Mik'ail and
a thousand angels on his right flank. The third by Angel Israfil and a thousand
angels on his left flank and that the angels had fought alongside the believers
wearing turbans of white with a piece that hung down from the back. He also
spoke of their mounts and told his companions that the angels rode piebald
horses. This was the only battle in which the angels took part.