This book, first published in 1965, examines the doctrine for fighting a conventional war against a nuclear power. Troops must be deployed as if they were fighting a nuclear war: dispersed over a greatly extended battlefield, conducting mobile operations, with no fixed front line, or static defence system, or defence zone. A new strategy of forward defence is needed, whereby significant numbers of troops are dispatched into the enemy's rear, and this book lays out such a strategy, and thereby sets a proposal for the future safety of Western Europe.