The pilot of the tailwheel-equipped airplane reported that, while landing off-airport on rough grass terrain, the airplane struck a "bump" and bounced. After touching down again, the pilot applied brakes with the tail up, attempting to stop prior to the top of the hill. The airplane continued and proceed downhill with the tail up, applying brakes and hitting additional bumps. Subsequently, the airplane nosed over.

The airplane sustained substantial damage to the fuselage and left wing lift strut.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.