The Battle of Bosworth Field in 1485 is one of the most significant battles fought on English soil. It effectively brought to an end the Wars of the Roses, resulted in the death of a King and ushered in the Tudor dynasty. The talk paints the background of the Wars of the Roses, the accession of Richard III - of the House of York - to the throne under the shadow of the disappearence of the Princes in the Tower, and the rivalry of Henry Tudor - of the House of Lancaster. I describe the uprisings which culminated in the abortive invasion of 1483, and then I follow Henry Tudor's invasion of 1485 and his passage through Wales and into England to confront King Richard near Leicester. I compare the strength and weaponry of the two armies before describing the battle itself - a battle which was not well reported nor described and the exact location of which has been the subject of much argument. Key to the outcome of the battle was the treachery of many of King Richard's supporters and the all-or-nothing gamble that was Richard's fatal charge.