
Whistler drew the Fighting Peacocks about 1884/1885 and gave it to Robert Goodloe Harper Pennington (1854 or 1855-d. 1920) , who gave it to Isabella Stewart Gardner (1840-1924).

Fighting Peacocks, I.S. Gardner Museum
It is fully catalogued in MacDonald 1995 (cat. rais.) [more] (cat. no. 992).

Fighting Peacocks, I.S. Gardner Museum

Panel of Fighting Peacocks in The Peacock Room, Freer Gallery of Art

Fighting Peacocks, I.S. Gardner Museum

Panel of Fighting Peacocks in The Peacock Room, Freer Gallery of Art
Harmony in Blue and Gold: The Peacock Room y178 was at that time the dining room of the house of Frederick Richards Leyland (1832-1892) in Prince's Gate, London. Whistler did not have access to the room by this date, and may have drawn this from memory.

Fighting Peacocks, I.S. Gardner Museum

Panel of Fighting Peacocks in The Peacock Room, Freer Gallery of Art
A drawing, possibly from memory, of the large painting on the end wall of Harmony in Blue and Gold: The Peacock Room y178.
Hadley considered the drawings were made in preparation for the decoration, but this is unlikely. 1
It was not, as far as is known, exhibited in Whistler's lifetime.
1: Hadley 1968 [more], pp. 37-41, no. 18.