" There are two enemies and two theatres: the task of the Commander is to choose in which he will prevail. To choose either, is to suffer grievously in the neglected theatre. To choose both, is to lose in both. The Commander has for his guides the most honoured principles of war and the most homely maxims of life. ‘First things first!’ ‘Being before well-being!’ ‘What you do, do well!’ ‘Always be strongest at the point of attack!’ It is the application of these simple rules to the facts that constitutes the difficulty and the torment "

― Winston S. Churchill , The World Crisis, Volume V: The Eastern Front