On 18 April the PAVN 308th Division attacking from the southwest attempted to outflank Đông Hà but were repulsed by a tenacious defense and intense US airstrikes.[1]: 74–5 [2]: 38–9 On 23 April the 147th Marine Brigade returned to Ái Tử and the 258th Marine Brigade redeployed to Huế leaving its 1st Battalion at Firebase Pedro under the control of the 147th Brigade.[2]: 40