Don't remember actual date but do know it was in the early 1960's//This happened one night when I was Driving a Semi (Transport) and approaching Williston from the east along Hi-Way #2.Also there was still Snow on the ground (probably in February or March)Approximately 40 miles East of the City/Town I noticed a light to the south of me which I took to be a Farm or Ranch Yard light.As I proceeded westerly and noticed that the light was staying opposite me I realized this was no Yard light.// when I was about 20 miles from Williston the light took off at a high speed and then stopped apparently above the City. It hovered there for a few minutes and then emitted a huge glow which Showed it to be monstrous in itself/(Like a couple of football fields)At the same time several small Blue lights converged on it from various directions and disappeaered into it. When I reached Williston everyone was talking about how it had illuminated the entire city and the local Radio Station reported that their Switchboard was floode with calls about the incident. Because I was at a higher elevation while approaching the city as it is a hilly part of the country I don't know if the smaller blue lights were actually visible to the inhabitants as they did seem to cme from above the main light. Once these smaller lights had seemed to enter what I now call the "Mothership" it took off straight up at an incredible rate and just disappeared.. Of all the sightings of Extraterrestrials I have hears of or read about this is one Incidence I have never seen mentioned anywhere.. am sure there are still people alive and living in Williston who would /could be able to remember and verify this event.. . ..