Defence Force historians John Crawford and Matthew Buck have found that more than 16,000 New Zealand troops served at Gallipoli, almost double the accepted number of 8556.
They have published their research in an e-book, Phenomenal and Wicked: Attrition and Reinforcement in the New Zealand Expeditionary Force at Gallipoli.
The book is informed by the notebooks of the deputy assistant adjutant general of the New Zealand and Australian Division in Archives New Zealand which Crawford found in the files of Archives New Zealand.
Another key to the research was the more recent discovery of financial records that show exactly how the New Zealand forces were distributed over the course of the campaign.
The book also provided insight into the planning undertaken prior to the main body of soldiers leaving New Zealand in 1914, Crawford said.