The ARVN 3rd Task Force, 81st Ranger Group commanded by Major Pham Chau Tai defended Tan Son Nhut and they were joined by the remnants of the Loi Ho unit. At 07:15 on 30 April the PAVN 24th Regiment approached the Bay Hien intersection () 1.5 km from the main gate of Tan Son Nhat Air Base. The lead T-54 was hit by M67 recoilless rifle and then the next T-54 was hit by a shell from an M48 tank. The PAVN infantry moved forward and engaged the ARVN in house to house fighting forcing them to withdraw to the base by 08:45. The PAVN then sent three tanks and an infantry battalion to assault the main gate and they were met by intensive anti-tank and machine gun fire knocking out the three tanks and killing at least twenty PAVN soldiers. The PAVN tried to bring forward an 85mm antiaircraft gun but the ARVN knocked it out before it could start firing. The PAVN 10th Division ordered eight more tanks and another infantry battalion to join the attack, but as they approached the Bay Hien intersection they were hit by an airstrike from RVNAF jets operating from Binh Thuy Air Base which destroyed two T-54s. The six surviving tanks arrived at the main gate at 10:00 and began their attack, with two being knocked out by antitank fire in front of the gate and another destroyed as it attempted a flanking manoeuvre.