Holding the rank of Commander, he served as commanding officer of the light cruiser SLNS Oceanus. In mid-1922 PD, his ship escorted several intervention battalions to the Mobius System, to help subdue a revolutionary movement on Mobius Beta.
He supported the ground fighters with kinetic strikes from orbit, until a Royal Manticoran Navy strike force arrived. Commodore Aivars Terekhov informed him that he had ten minutes to abandon and scuttle his ships, or be destroyed. Realizing that the Manticoran ships would be able to kill off all his units without even risking a scratch on their own hulls, Watson gave up his ships and had them rigged to blow up. (HH14)