Tuhia he tomokanga mō tēnei wāhanga - I whakatūria te Fifth or Reserve Army 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 te ngaronga o te Fifth Army i te whakaekenga o te puna o Tiamana i te Maehe 1918
He aha? I whakahoutia ano i te marama o Mei 1918 i raro i te whakahau a General William Birdwood.