The phrase 'demonstrated prowess' is correct and usable in written English.
You can use it when describing someone who has displayed a high level of skill or ability in a particular task or activity. For example, "She demonstrated her prowess in tennis by winning the tournament."
Long before gamers began displaying their badges online to demonstrate prowess, Girl Scouts were sewing theirs on sashes for everyone to see.
INSTEAD of demonstrating prowess with a ball or puck, the challenge for the competitors is bringing Brahms to his knees, scoring on Purcell, working a power play on Beethoven or slam-dunking Scarlatti.
Still, it failed to demonstrate prowess at navigating rough waters.
Rather, it becomes a place to advance physical recovery, to demonstrate prowess, to build relationships and bonds with others, and to regain the psychological strength with which to transcend trauma, to return to their families, to reengage in positive and remunerative work, in the military and elsewhere, and to regain the wholeness of mind and spirit that will enable their survival and success.
The first reliable report of Malcolm II's reign is of an invasion of Bernicia in 1006, perhaps the customary crech ríg (literally royal prey, a raid by a new king made to demonstrate prowess in war), which involved a siege of Durham.
The Athletics demonstrated their prowess this past weekend.
Taylor also demonstrated her prowess with the gloves very early in the game.
Ms. Koh has already demonstrated her prowess as a Bach interpreter during lunchtime concerts presented by the Miller Theater.
Having demonstrated his prowess at Guitar Hero, Chris switched over to another music game called Rock Band, which lets gamers play drums in addition to guitar.
And he demonstrated his prowess at this site a year ago when he pulled into Pimlico Race Course with a colt named Red Bullet and upset the Derby winner, Fusaichi Pegasus.
Prada demonstrated its prowess in the light stuff by sweeping the final two races of the challenger's trials in moderate breezes.
