Kammala jumla mai zuwa: Rundunar ta tashi zuwa Portugal a watan Yulin 1808 don yin aiki a Yakin Peninsular. Rundunar ta yi yaƙi a cikin
Yaƙin Roliça da Yaƙin Vimeiro a watan Agusta 1808, Yaƙin Corunna a watan Janairun 1809 da Yaƙin Bussaco a watan Satumba na 1810. Ya sami sunayen laƙabi "Tsohuwa da Bold", "The Fighting Fifth" da kuma "Lord Wellington's Bodyguard". Ya kasance wani ɓangare na ƙaramin ƙarfin da ya ci gaba da rinjaye na abokan gaba a El Boden a 1811, wasan kwaikwayon da Wellington ya sanar da Sojojin a matsayin "misali mai ban mamaki na abin da za a iya yi ta hanyar kwanciyar hankali, horo, da amincewa".