Naw...naw. Liked the book's ending better. It was crushing the first time I saw it. I've watched the movie several times since. I've accepted the movie ending was more palatable for the masses. Gotta have that happy ending.
SPOILER. In the book, the original story, they fail to blow the bridge. The Colonel (Alec Guinness in the movie) stops them and saves "his". bridge.
Yes, watch the movie, it's great, but then Alec Guinness is in it. 'Nuff said.