Rubuta ci gaba don wannan sakin layi - Rundunar ta tashi zuwa Portugal a watan Yulin 1808 don yin aiki a cikin Yaƙin Peninsular. Rundunar ta yi yaƙi a yakin Roliça
da yakin Vimeiro a watan Agusta 1808, yakin Corunna a watan Janairun 1809 da yakin 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".