The Hour of the Thin Ox is a novel by Colin Greenland published in 1987.
The Hour of the Thin Ox is a novel in which warfare is conducted using balloons, old-fashioned guns, and biological weapons.
Dave Langford reviewed The Hour of the Thin Ox for White Dwarf #91, and stated that "Greenland's real story begins in the southern jungle at about chapter 12, and continues into mystery beyond the end of the book: yet I don't think there's to be a sequel. Odd."[1]