In 1915 he took part in the
Battle of Neuve Chapelle. He fought alongside soldiers from India. The casualty rate of officers was very high, attrition rates of over 100. Two of his friends were killed. The shelling was terrific, and the Germans had very accurate snipers. Reid was wounded in the head at the
Second Battle of Ypres in April 1915. In his copious correspondence to his Headmaster in St John's College, Johannesburg he explained his motives and experiences. Of the regiment's complement of 30 officers and 1000 men, only 7 officers and 300 men remained after only two months in the theatre of operations. At Ypres they were gassed; and he praised the men who "carry an enormous weight on their packs...their marvellous imperturbability and cheerfulness...They face death as if it was a common occurrence." He took strength from their courage. Having been sent home wounded, he returned to France in September 1915. He was a lieutenant with the 1st battalion, having been promoted to that rank in March, until promoted to captain in December in "one of the finest and oldest of the British Regiments." The British now had trench mortars. But he was wrong to think the war would be won by summer 1916. He had already been wounded a second time at
1st Battle of Arras in April 1915, spending all the months to July 1916 in England. He did not serve in the Somme, but was sent to India on the North-West Frontier with 2nd battalion. In December he arrived in Mesopotamia, promoted to captain and transferred into the
Loyal North Lancashire Regiment, attached to the 6th Battalion. He was perhaps naive in his assessment of the Turk as "much more of a sportsman than the Germans..." ==For Valour==