Lots of modern examples. Most faroe islands come from Viking males, raiding England or Ireland, killing and pillaging the local population, and kidnaping the w

Lots of modern examples. Most faroe islands come from Viking males, raiding England or Ireland, killing and pillaging the local population, and kidnaping the women off to their island. "The Faroese are of mixed Norse and Gaelic origins. About 21,000 Faroese live in neighbouring countries, particularly in Denmark, Iceland and ... studies show that mitochondrial DNA, tracing female descent, is 84% Celtic." But in this case the invaders were in smaller numbers, and the local population was large enough could absorve the blow and still survive. If the invading people are in much larger numbers, they can easily wipe out the local population.