King registered his fifth victory, an LVG, after raiding Armentières on 25 July 1918. Four days later, he led a flight of six Camels from No. 4 Squadron escorting Airco DH.9 light bombers of the Royal Air Force in another raid on Armentières. In an action that the Australian official history highlighted as an "example of cool and skilful air fighting", the DH.9s completed their bombing mission while the Camels drove off an attacking force of at least ten German Fokkers, three of the Australians including King claiming victories, without any Allied losses. He destroyed a German two-seater on 3 August and another the following day, sharing the second with Herbert Watson. No. 4 Squadron was heavily engaged in the Allies' great offensive on the Western Front, launched with the Battle of Amiens on 8 August. King was credited with two victories—a balloon and an LVG—near Estaires during a bombing raid on 10 August. On 12 and 13 August, the Camels of No. 4 Squadron operated in a massed formation over Flanders with the S.E.5s of No. 2 Squadron AFC, the former's two flights led by Cobby and King, and the latter's by Adrian Cole and Roy Phillipps. Pickings were scarce and No. 4 Squadron's only success came on the second day when King and his flight collectively destroyed a two-seat Albatros.