High Quality Content by WIKIPEDIA articles! The Ellsworth UFO case occurred in 1953. On August 5 and August 6, 1953 the US Military investigated a UFO incident in Bismarck, North Dakota. What has become known as the Ellsworth Case is one of the most significant radar-visual cases in the annals of UFO sightings. The event was witnessed by almost forty-five agitated citizens along with military Air Defense System personnel. The object was first sighted by Miss Kellian at 8:00 P.M. on August 5. The description was of a red glowing light making long sweeping movements. The information was transmitted to the Bismarck, North Dakota, Air Defense Filter Center. Sometime later Sergeant Harry spotted the objects from the roof. He observed, paying close attention to the irregular movement, as it danced between telephone lines. Others on duty saw the moving light which would be visible in the night sky for approximately three hours. Sergeant Harry described his observance in the following manner: It would remain stationary--then hop up several degrees very quickly--almost simultaneously.