Tuhia he tomokanga mo tenei whitianga - 2 Ko te whakapapa o te CER e kitea ana ki te 4th Field Company (4 Fd Coy) Royal Australian Engineers, i whakaarahia i nga wa o te Pakanga Tuatahi o te Ao. I whakaingoatia te 7th Field Company (7 Fd Coy) i te tau 1915, i rongonui te waahanga mo tana mahi i Parani me Belgium i te Pakanga o Somme, Menin Road me te Raina Hindenburg. I te Pakanga Tuarua o te Ao, 7 Fd Coy i whawhai ki nga Hapanihi i Kokoda
i runga i a Bougainville.