Mind-Benders of Jewish History
A rabbi who led armies into battle
Samuel HaNagid (993-1056) was not only a Hebrew poet and Talmudic scholar but the vizier of the Muslim taifa of Granada, and for roughly seventeen years its battlefield commander, personally leading the kingdom's army on campaign.
How we know
Samuel ibn Naghrillah (HaNagid) b.993 d.c.1055-1056; vizier of Granada and field commander of its army for ~17-18 years (Samuel ibn Naghrillah Wikipedia; Britannica 'Samuel ha-Nagid'; Jewish Virtual Library; Jewish Encyclopedia).
One of many fact-checked wonders across eight traditions at The Spring of Wisdom.