Dinosaurs would allow several possibilities, though it would mostly have to be therapods, since plant eaters are little more then food with some exceptions. raptos could be cavalry, the T-rex something like a battlemachine, possibly make age advancements like Triassic, Jurassic, and cretaceous periods, for naval my suggestion would be the liopleurodon, 25meters long and weighing 80 tons, despite what wikipedia says most sources agree on these estimates so it could be an apex super unit but unable to attack on land