Barbara and phcollector - I have both the GO for my husband's Bronze Star and the citation. I had to order the GO from National Archives. The GO does only have the place and the date and the notation that it is for heroic achievement.It also contains the unit name. That GO also has a number of other names on it giving the same info about each of those men. It does not tell just what they did to receiver the award. It presents it only.
I also have the citation which tells the specific action in some detail about why he received it. It was typed on a simple piece of paper with an Army seal pressed into it in the presentation box with the Star. My husband had this and it did not come from any archives. I have no idea how you find out this bit of info. Sorry. Mary