While the 1st Cavalry Division was repelling the Tet Offensive, the 26th Marine Regiment was taking heavy bombardment and ground attacks at the Khe Sanh Combat Base. On 1 April 1968, the 2nd Brigade, alongside other 1st Cavalry Division elements, conducted Operation Pegasus in order to relieve the Marines at Khe Sanh. The 1st Cavalry Division completed the relief of the Marine units on 10 April and assumed responsibility for the Khe Sanh area of operations. When Operation Pegasus was concluded several days later, more than 1200 enemy fighters had been killed.