Mezue ahịrịokwu na-esonụ: N'ịbụ onye e nyere ọrụ dị ka onye na-ahụ maka ụkwụ na 1793, ma bulie ya elu na 1794, o jere ozi na mkpọsa nke 1808<unk>9 na Agha Peninsular, dị ka Major na 32nd Regiment, ma nọrọ na agha nke
Roliça, Vimiero, na Corunna. Johnson mechara jee ozi na njem Walcheren na 1809. N'afọ 1810, ọ ghọrọ lieutenant-colonel na 3rd Ceylon Regiment.