The 25th were certainly present in the campaign but not at the battle of Waterloo, save for three individuals who all received Waterloo medals. Two were officers attached to the army's staff and the third was a private who had taken a wrong turn when marching out of hospital in an evacuation and who attached himself to the 33rd Foot until a wound caused him to quit the field. As a Paymaster your ancestor would not have been expected to be in the ranks during a battle and another unit records the Paymaster leaving to take up station in a rear area during the morning of Waterloo.