This would be an agojie, or female soldier, from the West African kingdom of Dahomey, which occupied the area of modern Benin between 1600 and 1904 AD. Recognized in their time for their discipline and ferocity in battle, the so-called “Dahomey Amazons” have become famous as real-life manifestations of the “warrior woman” trope, thus making them a sort of feminist symbol.
Alas, their legacy had many negative aspects as well, for a major proportion of their activities consisted of raiding other kingdoms in the region to procure captives and sell them to European slavers. It goes to show you how cruel and complicated history can be, even if it can also be inspirational.