Percival was formerly 5826 in the Hertfordshire Regiment. Although Cornelius’ name was never individually mentioned in the Berks Regimental diary, it show us that events on the day he died were highly eventful and we presume he fell as a consequence of them. On the night of the 30th July 1917 the battalion moved from Dickebusch camp and the Blue line was captured, this was followed by a severe artillery barrage. “Tanks held up by the bog on the Southern side of Ypres – Menin Road, the battalion continued to advance, and at this point heavy machine gun fire stopped.”
The next day, the day that Cornelius died, the battalion formed by 10.10am and they were determined to push forward under cover of rifle fire. Orders were issued that as soon “as the barrage opened every endeavour was to be made to push on and gain as much land as possible.” When the barrage subsided three enemy aeroplanes appeared and drove off the British contact aeroplanes. Later an aeroplane flew up and down, firing its machine guns, five tanks were hit directly and there was artillery fire on the broken down tanks. Although fire was opened no planes were brought down.