Dogs of War was good enough for it to be the basis for multiple attempted mercenary led coups. Hoare's in the Seychelles failed because his forces went in by plane instead of boat and met the problems which Forsyth foresaw. Denard's guys (if I remember correctly) were given copies of the book with bookmarks to indicate what to do next.
takinola|8 months ago
Fun fact, he started out as a war journalist and got fired for playing favorites and slanting his coverage towards one side. IIRC, he only started writing as a fallback after that.