Red River(Winds of War‪)‬

In Red River, the seventh volume of the Winds of War series, WIII continues to rage as Lieutenant Commander Leo Baxter and his Riverines battle Axis forces in the Gulf of Oman, the Gulf of Aden, and finally-on the Niger River in Africa. Nigeria's rightful leader has been kidnapped by the Black Axe arm of the Neo Black Movement, and is being held for ransom.
The Allies want Abeo Kabir to be freed, but Nigeria's vice president doesn't. Nor does the leader of the terrorist organization called Boko Haram, or the Chinese diplomat, charged with putting a puppet government in place.
Should Baxter and his Riverines fail, China will establish a military foothold in Africa, and the people of Nigeria will suffer under the rule of a despot.