Nigeria’s Fight Against Boko Haram Gets Help From South African Mercenaries

Hundreds of South African mercenaries and hired fighters of other nationalities are playing a decisive role in Nigeria’s military campaign against Boko Haram, operating attack helicopters, armored personnel carriers and fighting to retake towns and villages captured by the Islamist militant group, according to senior officials in the region.

The Nigerian government has not acknowledged the presence of the mercenaries, but a senior government official in northern Nigeria said the South Africans — camped out in a remote portion of the airport in Maiduguri, the city at the heart of...