RedactedNarrative: According to witnesses, Vessel 1 attempted to drive his boat westbound onto his lift three times and the third time when the Operator put the boat into reverse to travel eastbound it made a horseshoe maneuver at a moderate speed and traveled westbound striking Vessel 2 that was unoccupied on a lift causing damage to both vessels.  Vessel 1 Operator stated the same as the witnesses but indicated the cable/line to his boat's shifter had broken when he put the boat into reverse the third time and he was unable to avoid the accident.