Assyrian_volunteers_capture_Turkish_banner_1918.jpg

Summary

Description	English: Agha Petros, wearing his distinct white hat, can be seen saluting his soldiers as he rides by a captured Turkish banner. This photo is from the National Army Museum of the UK.
Date	1918
Source	https://collection.nam.ac.uk/detail.php?acc=1983-12-71-189
Author	Major W Leith-Ross

This work created by the United Kingdom Government is in the public domain .

This is because it is one of the following :

It is a photograph taken prior to 1 June 1957; or
It was published prior to 1974; or
It is an artistic work other than a photograph or engraving (e.g. a painting) which was created prior to 1974.

HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply )
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National Army Museum, Out of Copyright