John Philip Jones wrote the book around PP's diary some time after his death. It isn't a history of 17th or 116th Regiments. As 2IC Pettit was effectively the regimnetal recce officer and concerned with the movement of the guns. The battery and troop commanders were usually detached and working with the infantry units for which they provided direct support. Peter's diary entry for 9th August is full of incident as it records a bad day for the regiment. He may not have been aware of what was happening to the BCs with the infantry.