New Zealand troops move down a corduroy road near Gravenstafel, early on the morning of 4 October 1917, at the start of the New Zealand Division's involvement in the Third Ypres offensive. Image courtesy of the Alexander Turnbull Library, Ref: 1/2-012938-G
During the First World War major battles resulted in significant losses and peaks in the casualty numbers. The soldiers called these "stunts" or "big pushes".
In August 1915 - 1,331 lives were lost. The Battle of Chunuk Bair was the main reason.
In September 1916 - 1,916 lives were lost. The Battle of The Somme was the main reason.
In June 1917 - 1,275 lives were lost. The Battle of Messines
was the main reason.
But October 1917 was the darkest of all with two major battles in the Passchendaele