Averill was commissioned as a
second lieutenant after training at Trentham Military Camp. Arriving in France in May 1918, he was posted to the 4th Battalion of the
New Zealand Rifle Brigade. He fought in the
Second Battle of Bapaume in August, leading a company of the battalion and was awarded the
Military Cross for his gallantry and leadership during the battle. Afterwards, he was posted to the Divisional Traffic Control Branch. In November 1918, the Rifle Brigade was tasked with the
capture of the fortified town of Le Quesnoy. The town was surrounded by extensive ramparts which made a direct assault difficult, particularly as the town itself could not be bombarded due to the civilians present. On 4 November 1918, Averill, now the battalion's intelligence officer, scouted the defences and was able to locate an approach route that was not under fire from the German defenders. A platoon brought up a 30-foot ladder which Averill was able to ascend to reach the top of the ramparts. Seeing off two Germans manning a guard post with revolver fire, the rest of the platoon, and shortly thereafter the battalion, joined him and entered the town. The Germans quickly surrendered Le Quesnoy. The war ended the following week and from December, Averill performed occupation duty in Germany for the next several months. ==Later life==