"Blitzkrieg is, of course, a German word meaning 'lightning war'. The ironic thing is that it was in many ways a British invention, derived from the lessons of the Western Front in the First World War. Captain Basil Liddell Hart had drawn his own conclusions from the excessively high casualties suffered by both sides. As an infantry subaltern, he himself had been gassed, the long-term effects of which forced him to retire from the army in 1927, after which he turned to journalism, working as defence correspondent for the Daily Telegraph and then The Times and publishing numerous works of military history. In Liddell Hart's view, the fatal mistake of most offensives on the Western Front had been their ponderous and predictable directness. A more 'indirect approach', he argued, would aim at surprising the enemy, throwing his commanders off balance, and then exploiting the ensuing confusion. The essence was to concentrate armour and air power in a lethal lightning strike."