Churchill's Island describes the military and civilian elements that were involved in the Battle of Britain. The Royal Air Force in an epic battle with the Luftwaffe, was able to wrest control of the skies, while the Royal Navy controlled the sea lanes around the embattled island. Other aspects of the struggle that are depicted included the British coastal defenses, the establishment of a mechanized cavalry, the role of merchant seamen and, after the Dunkirk evacuation, the re-building of a decimated British Army.