In late June after 22 days of fighting the ARVN 7th Division recaptured Kompong Trabek and cleared Route QL-1 (Cambodia) to Neak Loeung, however the PAVN recaptured the area when the 7th Division was withdrawn back into IV Corps in July to counter the PAVN/VC threat to Route QL-4, the vital supply line between the Delta's ricebowl and Saigon. With the return of the ARVN 21st Division and 15th Regiment, 9th Division to IV Corps and continuous pounding from the air by U.S. tactical air and B-52's, the ARVN was able to mount a series of operations in Định Tường Province and Base Area 470 that forced the PAVN/VC to reduce their operations and disperse into smaller units or withdraw into Cambodia.