Nyorai kupfuurira kweiyi ndima - Muna September 1796, Johnston akagadzwa kuva mubetseri-de-musasa kuna Gavhuna John Hunter, uye muna 1800 akagamuchira chinzvimbo chake chepamutemo saMajor. Mugore rimwe chetero Johnston akasungwa neLt. Gavhuna William Paterson achipomerwa mhosva "yekubhadhara mweya kune musoja sechikamu chemubhadharo wake uye kusateerera mirairo". Johnston akaramba kutongwa nedare rehondo mucolony, uye Hunter akamutumira kuEngland. Ikoko zvinetso zvokutonga nezvapupu muAustralia zvakatungamirira kukubviswa kwenyaya yacho, uye Johnston akadzokera kuNew South Wales muna 1802. Muna 1803 Johnston akatora mutungamiri wenguva pfupi weNew South Wales Corps panguva yekurwara kwaPaterson, uye akabatanidzwa mukukakavadzana pakati paMambo nemauto. Muna March 1804 akaita nokusarudza paakanga achitungamirira uto rakatumwa kuzorwisa vamwe vasungwa vakanga vapandukira paCastle Hill
. Apo Paterson akatumirwa kuPort Dalrymple, Johnston akava mutungamiri weNew South Wales Corps.