On this day, 1915, Lieutenant Colonel John McCrae, Commanding 3 Canadian General Hospital, wrote 'In Flanders Fields'.

He fought in the Second Battle of Ypres in the Flanders region of Belgium, where the German army launched one of the first chemical attacks in the history of war. They attacked French positions north of the Canadians with chlorine gas on April 22, 1915 but were unable to break through the Canadian line, which held for over two weeks. In a letter written to his mother, McCrae described the battle as a "nightmare",

For seventeen days and seventeen nights none of us have had our clothes off, nor our boots even, except occasionally. In all that time while I was awake, gunfire and rifle fire never ceased for sixty seconds ... And behind it all was the constant background of the sights of the dead, the wounded, the maimed, and a terrible anxiety lest the line should give way.

— McCrae

Alexis Helmer, a close friend, was killed during the battle on May 2. McCrae performed the burial service himself, at which time he noted how poppies quickly grew around the graves of those who died at Ypres. The next day, he composed the poem while sitting in the back of an ambulance at an Advanced Dressing Station outside Ypres. This location is today known as the John McCrae Memorial Site.

In Flanders Fields

In Flanders fields the poppies blow

Between the crosses, row on row,

That mark our place; and in the sky

The larks, still bravely singing, fly

Scarce heard amid the guns below.

We are the Dead. Short days ago

We lived, felt dawn, saw sunset glow,

Loved and were loved, and now we lie

In Flanders fields.

Take up our quarrel with the foe:

To you from failing hands we throw

The torch; be yours to hold it high.

If ye break faith with us who die

We shall not sleep, though poppies grow

In Flanders fields.

We will remember them! Lest we forget.