Background: Ambrose was born in Lovington, Illinois, to Rosepha Trippe Ambrose and Stephen Hedges Ambrose. His father was a physician who served in the U.S. Navy during World War II.
Context: In 2002, Ambrose was accused of plagiarizing several passages in his book The Wild Blue. Fred Barnes reported in The Weekly Standard that Ambrose had taken passages from Wings of Morning: The Story of the Last American Bomber Shot Down over Germany in World War II, by Thomas Childers, a history professor at the University of Pennsylvania. Ambrose had footnoted sources, but had not enclosed in quotation marks numerous passages from Childers's book.  Ambrose asserted that only a few sentences in all his numerous books were the work of other authors. He offered this defense:  I tell stories. I don't discuss my documents. I discuss the story. It almost gets to the point where, how much is the reader going to take? I am not writing a Ph.D. dissertation.  I wish I had put the quotation marks in, but I didn't. I am not out there stealing other people's writings. If I am writing up a passage and it is a story I want to tell and this story fits and a part of it is from other people's writing, I just type it up that way and put it in a footnote. I just want to know where the hell it came from.  A Forbes investigation of his work found cases of plagiarism involving passages in at least six books, with a similar pattern going all the way back to his doctoral dissertation. The History News Network lists seven of Ambrose's more than 40 works--The Wild Blue, Undaunted Courage, Nothing Like It In the World, Nixon: Ruin and Recovery, Citizen Soldiers, The Supreme Commander, and Crazy Horse and Custer--contained content from twelve authors without appropriate attribution from Ambrose.
Question: Did he plagiarize any other times?

Answer:
A Forbes investigation of his work found cases of plagiarism involving passages in at least six books, with a similar pattern going all the way back to his doctoral dissertation.