The men of the 5th Division ('The Pioneers') were among the workhorses of the British Peninsular army. Lacking both the kudos and the wealth of letters, journals and memoirs of divisions like the 3rd and the Light, it is easy to overlook the part they played in the struggle that finally drove the French out of Spain and Portugal. Yet they were the first troops into the streets of Badajoz. They, along with the 3rd Division, played a crucial part in the great victory at Salamanca. And they made up the bulk of the troops that finally took San Sebastian after a protracted and bloody siege. There is also a surprisingly wide range of material that records both their exploits and the experience of serving in the war, extending from the voices of men in the ranks to company and staff officers, brigade commanders, and the journal of the aide-de-camp of the general most associated with the division, fames Leith. Looking at one division in detail also allows analysis of the divisional system as it functioned in Wellingtons Peninsular Army. The purpose of this study, therefore, is to retell a familiar story from a less familiar perspective and thus demonstrate the strategic relationship between the parts and the whole while also emphasising that wars are fought by individuals - and no two individuals react in the same way. Each man's experience is his own.