The new head of Britain's armed forces, Gen Sir David Richards, has warned that the West cannot defeat al-Qaeda and militant Islam. He said defeating Islamist militancy was "unnecessary and would never be achieved".
However, he argued that it could be "contained" to allow Britons to lead secure lives. Gen Richards, 58, said the threat posed by "al-Qaeda and its affiliates" meant Britain's national security would be at risk for at least 30 years.
The general, who will tomorrow lay a wreath at the Cenotaph in Whitehall in memory of Britain's war dead, said the West's war against what he described as a "pernicious ideology" had parallels with the fight against Nazi Germany in the Second World War.
In an interview with The Sunday Telegraph, the general disclosed that Prince William was unlikely to serve in Afghanistan but suggested that his brother Harry, training to be an Apache helicopter pilot, could return to front-line duty in Helmand province.
He said the British military and the Government had been "guilty of not fully understanding what was at stake" in Afghanistan and admitted that the Afghan people were beginning to "tire" of Nato's inability to deliver on its promises.