Whakaotihia te rerenga e whai ake nei: I whanau i te 17 o Poutu-te-rangi 1787 ki a Charles raua ko Ann Fergusson, i tukuna a Fergusson hei ensign i te tau 1801, i te 18th (Royal Irish) Regiment of Foot, i mua i te whakawhiti ki te 43rd (Monmouthshire) Regiment of Foot, e whakangungu ana hei hoia hiko marama i raro i a Sir John Moore i Shorncliffe. I whakatairangahia ia hei rangatira i te tau 1804, me te rangatira i te tau 1806, i mahi ia i roto i te Wahanga Maama puta noa i te Pakanga Peninsular. I tae atu a Fergusson ki ngā pakanga o
Ko Roliça, Vimeiro, (kei reira ia i whara ai), me Corunna, i reira tana rerenga hei waahanga o te rahui. I haere tahi a Fergusson ki te 43rd i te 1809 Walcheren Expedition i mua i tana hokinga ki te Peninsula, i wheako i nga mahi i te Awa Côa, Bussaco, Sabugal, Fuentes de Onoro, tae atu ki Ciudad Rodrigo me Badajoz, i reira ia i uru ai ki nga roopu whakaeke o te 43, i whara i nga wa e rua. I whakawhiwhia ki a ia he mētara koura mo tana mahi i Badajoz. Whai muri i te mahi pai i Salamanca i te tau 1812 i whakatairangahia ia ki te Pire kaore i hokona, ka uru ki te 79th Foot. I whakawhiti ia ki te 85th Foot, i kite i nga mahi i Bidassoa, Nivelle, Nive me Bayonne.