The 2nd Infantry Division was a Regular Army infantry division of the British Army, with a long history. Its existence as a permanently embodied formation dated from 1809, when it was established by Lieutenant General Sir Arthur Wellesley (later to become the Duke of Wellington), as part of the Anglo-Portuguese Army, for service in the Peninsular War. (Prior to this, it was common for formations with the same number to be temporarily established for a single campaign and disbanded immediately afterwards; divisions remained a permanent part of the British Army's structure only after the Napoleonic Wars).