We have GPS guided missiles big enough to knock out entire city blocks and can see you with infrared or night-vision cameras 30,000 feet in the air and rain down 30mm cannon rounds at 3,000 rpm or fire a volley of incendiary missiles and burn you out of the trench and then blast you to hell and back a few dozen times.
Military power and technology.
General Lee Prior to the Battle of Gettysburg could have something like the following:
"One more battle and we'll take Washington. This will end this war and guarantee our freedom."
"One more battle to humiliate the Yankee forces. This will be easy."
General Lee after the Battle of Gettysburg could have said something like the following:
"That did not go as planned. If only I had had Stonewall Jackson with me."
"How did it all go wrong? We were supposed to win."
"We must regroup quickly so they do not take advantage of our situation."
Answer:
Intelligent.
Small.
Quiet.
(credits to the rightful owners for these answers :)