There is no evidence of any pretext for the annexation: Rabbel II had an heir by the name of Obodas and though there was little fighting (attested to by the fact that Trajan did not adopt the appellation "Arabicus"), there does seem to have been enough of a defeat to humiliate the Nabataeans. The two cohorts that eventually found themselves in Arabia had sailed from Egypt to Syria in preparation for the action. Apart from some units of the Nabataean royal guard, this seems not to have been strongly resisted, as suggested by the fact that some Nabataean troops served as auxiliary Roman troops shortly after the conquest.