Fly By Wire
Read the book.... Fly By Wire, The Geese, The Glide, The Miracle on the Hudson by William Langewiesche.
It explains in detail the capabilities of the aircraft and the events which occurred. It by no means expresses that either Sully or FBW were the dominant contributing factor to being "the miracle" that we all know of. It does however allow you to decide on your own what was happening that day.
Also a very intersting read into FBW systems.