Rubuta ci gaba don wannan sakin layi - Warre ya halarci Kwalejin Soja ta Royal, Sandhurst a lokacin rani na 1807 kuma a watan Mayu na gaba an nada shi "mai taimakawa" ga Manjo Janar Sir Ronald Craufurd Ferguson. Bayan 'yan watanni, Warre ya koma ƙasarsa ta Portugal inda ya ga aikin a yakin Roliça
(17 ga Agusta) da Vimeiro (21 ga Agusta) kafin ya kamu da cutar dysentery. An tura shi zuwa Lisbon don murmurewa, inda Manjo-Janar William Carr Beresford ya yi maraba da shi a gidansa. Bayan da ya warke, Beresford ya sanya Warre a cikin ma'aikatansa kuma ya yi aiki a duk lokacin yakin Sir John Moore, ya ƙare tare da yakin Coruña a watan Janairun 1809.