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In page Slave raiding:

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Slave raiding is a military raid for the purpose of capturing people and bringing them from the raid area to serve as slaves. Once a common part of warfare, it is now widely considered a war crime.[citation needed] Slave raiding has occurred since antiquity. Some of the earliest surviving written records of slave raiding come from Sumer (in present-day Iraq). Kidnapping and prisoners of war were the most common sources of African slaves, although indentured servitude or punishment also resulted in slavery.[1][2]