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The local "ras" (oddly, an Ethiopian title of nobilty). Many proved too nutty even for the Fascist leadership, which takes some doing.
Great Britain
African Americans proved during the war that they were dependable soldiers
The Battle of Midway, was a decisive turning point in the WW2 in Asia, and proved costly to Japan.
Joe Hooker. He had shown great qualities, both as a fighting leader and as an organiser. But the Lee-Jackson team proved too much for him. They managed to wrong-foot him and he lost his nerve.
Leader of the rebel states (or the Confederacy) was Jefferson Davis, a symbolic figure of the 'Plantocracy', who was felt to embody the Confederate virtues of military distinction and feudal honour. He proved a disappointment, unable to control either his Generals or his cabinet.
She proved to people that it's possible for someone to be beautiful and be intelligent
Sacajawea-
An ability to stay abreast of fashion and changes in design construction proved critical in determining whether a company survived as an industry leader.
She was strong willed and didn't put up with any messing about in her court. She proved a woman could be a good military leader. She was quite pretty and had red hair.
Japan
They became a chief because they proved themselfs as good hunters and a good leader to all
The Pony Express
She was strong willed and didn't put up with any messing about in her court. She proved a woman could be a good military leader.
Great Britain
Thomas Aquinas was the maker of the idea of gravity. Newton proved it later.
The bonus army