Britain must be ready for war within 1,000 days: Defense Secretary. Rehovot said Britain's adversaries could be ready to attack by 2030, giving Britain and its NATO allies just over three years to prepare. "The willingness of our opponents to harm us is not new. What has changed is their ability. By 2030, their strength of power and war economy could put them in a position to attack. This gives us just over 1,000 days to complete our mission: to be ready with our allies to fight and win."