The Gallipoli Campaign holds a special significance for Australia and New Zealand. An annual commemoration on 25 April - marking the anniversary of Allied troops first landing on the Gallipoli peninsula in 1915 - began in 1916 and is now the most important day for remembering military casualties in both countries.
At the start of the First World War, Australia and New Zealand were both comparatively young nations. Their participation in that global conflict brought them onto the world stage and gave each country a strong national identity that remains to this day.
Soldiers from the Australian Imperial Force (AIF) and New Zealand Expeditionary Force (NZEF) were formed into the Australian and New Zealand Army Corps (ANZAC) in Egypt in early 1915. This combined force, including around 20,000 Australians and 8,500 New Zealanders, then joined British and French troops in the landings on the Gallipoli peninsula in April that year.
The Allied forces at Gallipoli suffered months of stalemate, and many thousands of casualties, as the early aims of the campaign were abandoned. All attempts to break through the Turkish lines failed, and the campaign drew to a close in late 1915. The final troops were evacuated from Gallipoli in January 1916.
These photographs show just some of the thousands of Australians and New Zealanders who served in the Gallipoli Campaign.
1. Wounded comrade
An Australian carrying his wounded mate to a medical aid post for treatment, Gallipoli, 1915.
2. Game of cricket
Allied troops in the only game of cricket played on the peninsula during the campaign. It was an attempt to distract the Turks from the imminent departure of Allied troops.
3. Anzac Cove
Australians landing at Anzac Cove, 25 April 1915.
4. First aid
Australians carrying wounded back from the firing line.
5. Quinn's Post
Support troops from the 4th Australian Infantry Brigade wait behind Quinn's Post, Gallipoli, after it was retaken on 29 May 1915.
6. Smiling Maori
A Maori soldier in the Apex trenches on 30 November 1915.
7. Despatch rider
An Australian despatch rider galloping along the coast road at Anzac Cove to avoid sniping. He is passing a war cemetery.
8. Back from leave
New Zealanders return to Gallipoli by picket boat after a rest in Lemnos.
9. Evening football
Men of the Australian Army Medical Corps playing football in the evening.
10. Taking a break
New Zealand soldiers resting in the trenches on Rhodedendron Spur, Gallipoli, a few weeks after it was taken.
11. Water for a wounded soldier
An Australian infantryman gives a drink to a wounded Turkish soldier during the Gallipoli Campiagn, 1915.
12. Bomb throwing
Australian troops practising bomb throwing.
13. Head wound
Australian soldiers dressing the head wound of an injured comrade with his first aid field dressing.
14. Dug-outs at Gaba Tepe
Australian and New Zealand troops at their dug-outs at Gaba Tepe.
15. Road-making party
An ANZAC road-making party, and a number of men of several units with a fatigue party of Turkish men, and French soldiers further back. In the background is the Old Castle at Sedd el Bahr.