By 1941, Wallace Beery was pretty much confined to playing two characters: The reprobate with the heart of gold, or the old-line martinet who resents the incursions of progress. In The Bugle Sounds, Beery opted for characterization #2, playing entrenched Cavalry sergeant Hap Doan. Accustomed to horses and horsemen, Sgt. Doan has a great deal of trouble adjusting themselves to those newfangled armored cars and tanks that the modern Army has introduced to his troops. By the time he's seen the error of his ways and entered the 20th century, old Hap has somehow gotten himself mixed up with enemy saboteurs. The secondary love interest in The Bugle Sounds is handled by William Lundigan and Donna Reed, while Wally Beery is offered a more mature amour in the form of boisterous Marjorie Main.
by Hal Erickson synopsis