His bravery has been passed down in stories by many people.
This military commander excelled in martial prowess.
That general excelled in military valor.
They take pride in their ancestors' valor.
勇敢 is an adjective describing brave conduct in general, while 武勇 is a noun tied specifically to martial valor.
剛勇 stresses raw physical strength combined with bravery, while 武勇 focuses more broadly on martial courage and skill.
武勇 means courage and heroism displayed in battle, whereas 武 in this archaic sense refers to valor itself as an inherent quality.
怯懦 means cowardice, the direct literary opposite of the martial courage expressed by 武勇.
勇武 uses the same two kanji in reverse order and also means brave/valiant, but it typically functions as a descriptive term for a person rather than the abstract noun 武勇.
Compound of 武 (bu, 'military') and 勇 (yū, 'bravery'). The reading ぶゆう is the on'yomi of both characters.