An essential element in forming a single electorate is the sense that in the last resort all parts of it stand, or fall, survive or perish, together. This sense the British do not share with the inhabitants of the continent of Western Europe. Of all the nations of Europe Britain and Russia alone, though for opposite reasons, have this in common: they can be defeated in the decisive land battle and still survive. This characteristic Russia owes to her immensity. Britain owes it to her ditch. The British feel – and I believe that instinct corresponds with sound military reason – that the ditch is as significant in what we call the nuclear age as it proved to be in the air age and had been in the age of the Grande Armée of Napoleon or the Spanish infantry of Philip II. Error or truth, myth or reality, the belief itself is a habit of mind which has helped to form the national identity of the British and cannot be divorced from it.