Tuhia he tomokanga mo tenei pene - I haere a Warre ki te Royal Military College, Sandhurst i te raumati o te tau 1807 a i te marama o Mei i muri mai ka tohua hei "aide-de-camp" ki a Major-General Sir Ronald Craufurd Ferguson. I etahi marama i muri mai, ka hoki a Warre ki tona whenua whanau o Portugal i reira i kite ai ia i nga pakanga o Roliça
(17 Akuhata) me Vimeiro (21 Akuhata) i mua i te mate o te mate o te mate. I tukuna ia ki te whakaora i Lisbon, i reira ka powhiri a Major-General William Carr Beresford ki a ia ki tona whare. Whai muri i tana whakaoranga, ka whakauruhia e Beresford a Warre ki tana kaimahi, a ka mahi ia i te pakanga katoa a Sir John Moore, ka mutu me te Pakanga o Coruña i te Hanuere 1809.