 Cotton akaendeswa kuIberian Peninsula muna Kubvumbi 1809, kwaakashanda saMutevedzeri Mukuru kuLight Division pasi paBrigadier-General Robert Craufurd. Cotton akanga aripo munguva yose yekudzokera kumitsara yeTorres Vedras uye mberi mberi, achiona chiito paHondo yeCoa. Musi wa 12 June 1811 akawana chinzvimbo cheLieutenant-Colonel muThird Guards uye akabva adzokera kuEngland muna Nyamavhuvhu. Cotton akadzokera kuPeninsula muna Kubvumbi 1813 uye akabatanidzwa Mukubatwa kweBurgos musi wa10-12 Chikumi, iyo yakasiyana nekusabudirira Kukombwa kweBurgos muna 1812. Akabva apinda muhondo dzakakosha dzeVittoria musi wa21 Chikumi 1813 neNive musi wa9 kusvika 13 Zvita. Cotton akabva ashanda muFrance, achiraira Light Division panguva yePassage yeAdour musi wa 23 Kukadzi 1814. Akanga achibatanidzwa muKukombwa kweBayonne uye akatungamira mapikicha eBrigade yeChipiri yeVarindi pausiku hweFrench Sortie, 14 April 1814. Paiva panguva yokufora kwechiFrench iyo, maererano nemanyoro omumwe mukuru mukuru weVarindi Captain Gronow, Cotton akatapwa. Iye akapukunyuka kupfurikidza nokurega wachi yake nemari yose yaaiva nayo, achirohwa nokuda kwemari duku. Cotton akadzokera kuEngland neFirst Battalion yeThird Guards muna Kubvumbi 1814, asi akadzokera kuFrance muna Chikumi 1815 nekuda kwekurasikirwa neSecond Battalion Officers paHondo yeWaterloo. 