After graduating from the University of Edinburgh, the 23 years old, and a temporary lieutenant in The Argyll and Sutherland Highlanders (Princess Louise's), British Army, was attached to 1/6th Battalion, The Highland Light Infantry during the First World War when the following deeds took place for which he was awarded the VC.

On one occasion when extra strong barbed wire entanglements were encountered, he organised and took forward a party and under heavy fire supervised the making of gaps.

Later, when the greater part of our line was definitely held up, Lt. Macintyre rallied a small party, pushed forward through the enemy barrage in pursuit of an enemy machine-gun detachment, and ran them to earth in a "pill-box" a short distance ahead, killing three and capturing an officer, ten other ranks and five machine guns.

When the battalion was ordered to take up a defensive position, Lt. Macintyre, after he had been relieved of command of the firing line, reconnoitred the right flank which was exposed.

The success of the advance was largely due to Lt. Macintyre's fine leadership and initiative, and his gallantry and leading was an inspiring example to all.