On 4 April 1965, the USAF made another attempt on the Thanh Hóa Bridge with 48 Republic F-105 Thunderchiefs of the 355th Tactical Fighter Wing (TFW) loaded with 384 x bombs. The Thunderchiefs were escorted by a MIGCAP flight of F-100 Super Sabres from the 416th Tactical Fighter Squadron (416th TFS). Coming from above, four MiG-17s from the 921st Fighter Regiment bypassed the escorts and dove onto the Thunderchiefs, shooting two of them down; the leader Tran Hanh downed F-105D BuNo. "59-1754" of Major F. E. Benett, and his element leader Le Minh Huan downed F-105D BuNo. "59-1764" of Captain J. A. Magnusson. The Super Sabres engaged; one AIM-9 Sidewinder was fired and missed (or malfunctioned), and another F-100D flown by Captain Donald Kilgus fired 20 mm cannons, scoring a probable kill. Tran Hanh's wingman Pham Giay went down and was killed. No other U.S. airmen reported any confirmed aerial kills during the air battle; Tran Hanh stated that three of his accompanying MiG-17s had been shot down by the opposing USAF fighters.