Pedzisa mutsara unotevera: Akagadzwa semukuru wemauto muna 1793, uye akasimudzirwa kuva kaputeni muna 1794, akashanda mumushandirapamwe wa1808-9 muHondo yePeninsular, saMajor mu32nd Regiment, uye aivapo muhondo dze
Roliça, Vimiero, uye Corunna. Johnson akabva apinda mubasa reWalcheren expedition muna 1809. Muna 1810 akava lieutenant-colonel mu 3rd Ceylon Regiment.