spread-eagled!

His hands and feet are roped up tightly, bound to tractors. Captain America is in spread-eagled position...

... on a missile silo surrounded by evil solders.
His famous star-spangled blue and red-white striped costume is tattered, only revealing Cap's superior muscular body.

Cap trys to break free, flexing his muscules. His exertion ends in futile but he is being torn limb from limb pulled by tractors.

Our hero is suffered in spread-eagled position. No more and no less but how exciting! I'm sure this is one of the most spine-tingling so called "superheroes in peril" scene in Captain America comic books.

surrender to save hostages

Captain America is forced to surrender, the villain ordered him from a school bus where students are held hostages.

Cap reluctantly put down the mighty shield and put the manacles on his hands by himself in front of many guns aiming at him.

I also love the situation of this kind: superheroes with superior super-human abilities can't do anything, rather have to surrender to their foe who is just a mere human, to save hostages. In this kind of situation, a superhero is completely intact, full of their power and energy physically, but is weakened and helpless mentally.