The Lone Pine Memorial, situated in the Lone Pine Cemetery at Anzac, is the main Australian Memorial on Gallipoli, and one of four memorials to men of the New Zealand Expeditionary Force. Designed by Sir John Burnet, the principal architect of the Gallipoli cemeteries, it is a thick tapering pylon 14.3 metres high on a square base 12.98 metres wide. It is constructed from limestone mined at Ilgardere in Turkey.

The Memorial commemorates the 3268 Australians and 456 New Zealanders who have no known grave and the 960 Australians and 252 New Zealanders who were buried at sea after evacuation through wounds or disease. The names of New Zealanders commemorated are inscribed on stone panels mounted on the south and north sides of the pylon, while those of the Australians are listed on a long wall of panels in front of the pylon and to either side. Names are arranged by unit and rank.

The Memorial stands over the centre of the Turkish trenches and tunnels which were the scene of heavy fighting during the August offensive. Most cemeteries on Gallipoli contain relatively few marked graves, and the majority of Australians killed on Gallipoli are commemorated here.

War service: Egypt, Gallipoli

Proceeded to join Mediterranean Expeditionary Force, Gallipoli, 16 August 1915.

Reported missing between 21 and 25 August 1915.

Letter, Mrs A. Sadler (mother) to Base Records, 6 November 1915: '... in the Sydney Mail of Oct. 27th I seen a group of wounded soldiers and there is one that I am almost sure it is my son and I went to the editor of the mail and seen the Photo and I think it is him only he looks older. it [sic] is in a convalescent home at Woodcote Park[,] Epsom[,] England. I went to Victoria Barracks and they said to write to you and you would find out for me. hoping [sic] you will soon let me know as I am very much upset. He might have lost his memory.'

Court of Enquiry, held at Tel el Kebir, 21 January 1916, concluded 'Reasonable to suppose dead (K.I.A.).'

Statement, Red Cross File No 24003091, A. DENT, 18th Bn (patient, St John's Hospital, Etaples, France): 'I believe this man to be identical with 2nd Lt E.W. Sadler who gained his commission at Gallipoli. He is brother to Lt. Sadler (Signal Officer 19th A.I.F.) whom I knew personally. I saw him talking to his brother in the early part of Oct. I do not think it likely that he was killed later as the 18th Batt had little or no fighting after that in August, and I rather think he went to the Bde. or Div. Staff.'