Whakaotihia te rerenga e whai ake nei: I whakatūria te Fifth Army, Reserve Army rānei i te marama o Mei 1916, i raro i te whakahau a te General Hubert Gough. I te tuatahi i mohiotia ko te ope taua Reserve, i whakaingoatia ko te Fifth Army i te Oketopa 1916. He nui ngā ngaronga o te ope Tuarima i te wā o te
Te whakaeke a Tiamana i te puna o Poutū-te-rangi 1918. I whakahoutia ano i te marama o Mei 1918 i raro i te whakahau a General William Birdwood.