Primitive War: Opiate Undertow

Primitive War: Opiate Undertow, originally released as Primitive War in early editions, is a 2017 self-published debut novel by American writer Ethan Pettus. The novel follows a group of American soldiers who encounter de-extinct dinosaurs in a jungle valley in Vietnam in 1968. It is the first book in the Primitive War series, and spawned a 2025 film of the same name.

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