USA attacked and destroyed many armies of the world.They may be "Brave warriors" or it may be their gadgets who give them the upper hand.
Electronics is involved in almost every war machine these days.Missiles,aircrafts perform better and better,but all is highly Dependant on computers.
Lets take examples.The F-16,and the Euro fighter are two of the most successful fighter jets in the world.Both these planes are highly agile and very manoevarable.
The secret is in the unstable designs.Both the planes are built unstable in all three dimensions.An onboard computer constantly adjust the manoevering mechanism to make the plane fly.Without the inboard computers,they will be chunks of titanium.
Same with the satellites.The pin point accuracy of the Americam cruise missiles depends on the GPS system.It is a constellation of 24 low earth orbit satellites,so arranged that at any instance,there are atleast 2 satellites above the horizon,anywhere in the world.
An earth station calculates the position of each satellite for the next 24 hours and beams the data to the satellites.The satellites transmit the data into the GPS receivers.The receiver calculates it's position relative to the satellite's position.Again depending on computers.
Even the soldiers on ground use embedded computers for firing accuracy.
If a so called Third world "rouge state" finds a way to disable the computers,it can have the upper hand.
The solution is out there.
It has been test fires in almost all gulf wars.Specially on iraq.It was an E-Bomb

"The U.S. Air Force has hit Iraqi TV with an experimental electronmagetic pulse device called the 'E-Bomb' in an attempt to knock it off the air and shut down Saddam Hussein's propaganda machine. Iraqi satellite TV, which broadcasts 24 hours a day outside Iraq, went off the air around 4:30 a.m. local time."

- CBS News, 3-25-03

E-bombs can unleash in a flash as much electrical power—2 billion watts or more—as the Hoover Dam generates in 24 hours. [And], although the Pentagon prefers not to use experimental weapons on the battlefield, "the world intervenes from time to time," - Defense Secretary Donald Rumsfeld.

- Time Magazine, 1-19-03

It is a totally non-lethal weapon.People do not die,and properties are not damaged.It unleashes a burst of high energy electromagnetic waves,which fry most electronic circuit within a small radius.
If this happens and the computers fail,almost all modern war toy will fail.
In a battle field,this weapon can turn tables and the side which is mostly mechanical than electronic will have the upper hand,and at present the biggest armies in the world are e-Armies.The rest are still highly dependant on the age old mechanical systems.
So it is not the end of the world for the countries at risk of attack from the mighty USA.
The most advanced military forces have this Achilles Heel ....."The computer"