Having beaten back two Austrian invasions, in 1915 Serbia set about preparing her defences against a third onslaught. The British naval mission to Serbia, under Rear-Admiral Troubridge, was intended to help her in these preparations, and to prevent the Austrians using the Danube as a means of communication and supply to Bulgaria. To this end minefields were laid, torpedo tubes sited and gun batteries placed, yet when the Austrians decided to move the British defences proved wholly useless: after a two-day bombardment the Austrians successfully crossed the Danube to invade Serbia.

This article is located in the History of the First World War Volume 3 (REF D522 .H58 1969 V.3).