WW I flying ace; an active champion for a strong independent air force, he was court-martialed for insubordination and suspended from duty for five years in 1925. Signed book: Winged Defense. NY: G. P. Putnam's Sons, 1925. Hardcover, 6 x 9, 261 pages. Signed and inscribed in fountain pen on the second free end page, 'To Mrs. H. Sutherland Deulinger, With the best regards of Wm. Mitchell, 'Boxwood' Middleburg, Va. 12/12/26.' In fine condition, with light toning to signed page, owner's bookplate, cover bindings a bit loose and light wear to covers and the sunned spine. RRAuction COA.