To support this thesis, the author provides several pieces of evidence. all of the following can be considered pieces of evidence used to support this thesis except: the letter from general smith to lieutenant rogers ordering the use of the xb-28 plane in addition to the b-17 a newspaper article with lieutenant rogers’s reference to using b-17, xb-28, and yb-40 warplanes in dresden joe williams’s diary entry describing himself in the seat of a yb-40 plane the author’s assertion that american forces used b-17, xb-28, and yb-40 warplanes to firebomb dresden