Abu Ubayd al Qurashi(Strategist/Analyst loyal to Al Qaeda and similar Jihadi organizations)says:
“Strategically, in the raid of 9/11, Al Qaeda destroyed the pillars of the American Defense Strategy which neither the Soviet Union nor any other enemy nation managed to do before.
These pillars are:
Early warning, Preventive attack and the Principle of Deterrence.
This raid also caused America’s abilities to be distributed on a greater surface area as it forced it to distribute its forces in many sites without making any achievements in any of them.”