The Collection in Context: Horace Pippin’s “Holy Mountain III” Sep 14, 2000–Mar 14, 2001 Horace Pippin, Dogfight over the Trenches, 1935. Hirshhorn Museum and Sculpture Garden, Gift of Joseph H. Hirshhorn, 1966 (66.4071) September 14, 2000, to March 14, 2001