The 9/11 attacks revealed that the transnational terrorist threat facing the US and its partners was far more dangerous than most had previously discerned. It was now clear that al-Qaeda intended to, and could threaten the Westαs ₁ particularly the USα ₁ political and military leverage, with the aim of shifting the balance of power from the West to Islam after a violent global confrontation. In that sense, the new terrorist threat is strategic, and it has led to a worldwide mobilisation comparable to that required by a world war.

Adelphi Paper 367.

Introduction--Ch. 1 Securing Territory Against al-Qaeda--Ch. 2 Law-enforcement and Intelligence Capabilities--Ch. 3 Social Science and Diplomacy--Ch. 4 Outperforming the Terrorists.