redbrunja | Sometimes I Lose My Faith In Luck

So I'm reading the Captain America comics, and I just hit the point where we have Natasha fighting to protect Steve's shield (side note: HOT DAMN was Natasha with Cap's shield on her back an amazing image) and I'm wondering, was this the first first first time that Natasha's history with the Winter Soldier was revealed/retconned? I'm assuming it was, and if so, for comics readers who were unspoiled what was that like, learning that?

Also, Sharon, my bb. Look at what they make you give.