Portrait of French Field Marshal Ferdinand Foch, taken before 1915. Image caption in Swedish: General Ferdinand Foch ; Överbefälhavare å franska vänstra flygeln" ([...]supreme commander of the French left flank).
Source: Det stora världskriget Vol. 2, page 481. Printed by Åhlen & Åkerlund, Stockholm 1915. No image source provided in the book, presumed public domain due copyright expiration/old age.
The top half of the number "70" is slightly visible in the lower left corner of the photo in the book (cropped version uploaded).
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Portrait of French Field Marshal Ferdinand Foch, taken before 1915. Image caption in Swedish: General Ferdinand Foch ; Överbefälhavare å franska vänstra flygeln" ([...]supreme commander of the French left flank). Source: ''Det stora världskriget'' Vo