Note that the actual paper does not make the claim from the title, and that they "recovered and sequenced ancient DNA from the teeth of 13 soldiers" (one molar

Note that the actual paper does not make the claim from the title, and that they "recovered and sequenced ancient DNA from the teeth of 13 soldiers" (one molar each) from one site only, which means other origins cannot be discarded, especially since these pathogens could only be found in 5 of 13.