My son and I saw the first craft coming from a northerly direction across the Red River in Northern Bowie County. It came in at an incredible speed and slowed almost to a halt approximatly 100 feet over our heads then performed a semi-circular maneuever. It continued at a slow speed and then we saw the reason for the maneuver. It had gotten in front of a rectangular craft that was matte black, approx 75 ft long, 40 ft high and approx 40 ft wide. In the front of the craft there was a small square window with light inside and another one on the side of the craft about the same size. The under-side of the craft had everything molded inside except for what appeared to be four thrusters on each corner of the craft. The first craft that performed the maneuver was a round sphere and was lit inside enough to make out a lattice-work frame, but could not make out anything else. We watched the two craft for about 2 minutes and we noticed 2 more of the spheres coming from the north as the others had. These two were identical the first sphere and like the first were coming in at an incredible speed but when they came in behind the rectangular craft, instantly matched its speed which was probably less than 20 MPH. All of this was done without creating one single sound. We could hear cattle bawling of in the distance and even birds rustling in the brush, but nothing from the four craft. My background at the time was in electronics and my son's was in law enforcement. I have worked on some very sophisticated integrated weapons systems, but this was beyond anything I had ever heard of before. Whomever they were and whatever they were; one thing is for sure; they were the masters of gravity.