midnight
Under sealed orders ! Where and what ! The _ Dewey _ was off ! Shortly after midnight the little craft got under way , with her nose pointed out of the harbor . `` I guess it 's ` so long U.S.A. ' this time , '' confided Jack to his chum , as they stood together , aft the conning tower . `` Gee , I 'm glad we 're off ! '' answered Ted .