New Zealand Herald, Volume LV, Issue 16848, 13 May 1918
After Gallipoli in France, Edgar was wounded in the left leg on 25 July 1916 returning to his unit on 29 September 1916 once recovered.
On 12 October 1917 Edgar was laying cable under heavy shellfire at Passchendaele. Like many other New Zealand men at the end of the battle he was missing. A court of enquiry was held to determine his status in May 1918 which concluded he was killed in action. One of the soldiers to give evidence at his enquiry was Sapper Norman H. McKenzie below is part of his statement taken from Boucher's military record:
"The last time I saw Sapper Boucher was when he was taking shelter from the shelling near Fleet cottage...I saw him crawl out of sight and if he remained he was certainly killed as the shelling was intense"
Edgar was 24 years old and is remember on the Tyne Cot Memorial, Tyne Cot Cemetery, Zonnebeke, West-Vlaanderen, Belgium with the many other New Zealander's who went missing on that fateful day.