Rubuta ci gaba don wannan sakin layi - An kafa runduna ta biyu a watan Agusta 1804 amma ya kasance a cikin United Kingdom a duk lokacin yaƙe-yaƙe na Napoleon. Rundunar ta 1 ta yi aiki a yakin Copenhagen a watan Agustan 1807 a lokacin yakin Gunboat. Ya tashi zuwa Portugal a farkon watan Agusta 1808 don yin aiki a cikin Yakin Peninsular kuma ya ga aikin a yakin Roliça.
a watan Agusta 1808, yakin Vimeiro daga baya a wannan watan da yakin Corunna a watan Janairu 1809 da kuma kwashewar da ta biyo baya. Daga nan ne rundunar ta shiga cikin bala'in Walcheren Campaign a cikin kaka na 1809.