War in the Air : Leonaur Ltd : 9781782828068 : 1782828060 : 05 Apr 2019 : The fourth volume of the history of air warfare--focusing on the war at sea and the Western Front This outstanding, multi-volume examination of aerial warfare during the First World War from the perspective of British air forces continues in volume four with accounts of two different theatres. As the war progressed Germany increasingly invested resources in the expansion of its submarine fleet. German surface warships were comparatively ineffective strategically, since Germany is poorly placed geographically as regards access to the seaways. Allied surface fleets meanwhile remained powerful with free access to supplies and ports across the globe. Escorted merchant ships carrying essential war materiel and other goods continued to dock in and depart from the British Isles. The German solution to disrupt seaborne traffic and so compromise the effectiveness of Allied armies in the field initially proved to be bruta