Photograph entitled: ‘The Sydney at Aden’, showing two ships at sea with the rocky outline of Aden behind, Yemen, 1915.
The caption probably refers to HMAS Sydney, an Australian cruiser. 
From a photograph album containing 24 images associated with Pte George William Josling 1/10th Bn Middlesex Regiment, showing local scenes and people in India, as well as people he served with.
From a collection of three albums covering the period 1914-1919. 
Associated with World War One, War at Sea (1914-1918).