Chilling True Story: The Train from Katanga by Wilbur A. Smith

Captain Bruce Curry has a simple enough to lead his mercenary soldiers to rescue a town cut off by rebel fighting in the Belgian Congo. But events quickly take a turn for the worse as it becomes clear that the town's diamond supplies are the real focus of the mission. And where there is treasure, danger always seems to follow.It isn't long before Curry finds something even more valuable than diamonds in the town. Something he'll do anything to protect. And soon he discovers that his most deadly enemies might be those closest to him . . .