Prowess refers to bravery and valor, especially inside the military context. It can also be used more broadly, meaning a superior skills or ability. It comes from the French prouesse.
At the Asian Art Museum, ‘Lords of the Samurai’ glimpses the warrior-aesthetes who combined martial prowess with cultural attainment. (LA Times)
Some commentators have assumed that the prowess of Japanese companies in acquiring foreign companies will mitigate the overall downturn at home. (Business Week)