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In page Equestrian at the 1972 Summer Olympics:

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A crowd of 60,000 spectators watched 73 riders from 19 nations competing on endurance day. The Roads and Tracks phases (Phase A and C) were held on flat ground. The cross-country test, designed by Ottokar Pohlmann, saw quite a few problems. Four fences in particular proved the most troublesome—producing a total of 38 refusals, 18 falls, and 7 eliminations—included a fence into the water (obstacle 12), a drop fence in a combination (obstacle 17a), a palisade up a hill (obstacle 18), and a ditch (obstacle 23).