It seems ironic that someone called Lieutenant Yule should die of wounds on Christmas Day, but that is the case.
Yule had been at war since 23 August 1914 when, as a corporal serving with the 2nd Battalion Seaforth Highlanders, he arrived in France as part of the original British Expeditionary Force. On 7 May 1916, Yule, now a serjeant major, was commissioned into the 7th Battalion Gordon Highlanders "for service in the field".
He must have been a valuable man. Twice during attacks in 1917 he served as an acting captain whilst still only a second lieutenant. On the second occasion he was awarded a Military Cross:

"2nd Lt. (A./Capt.) John Yule, Gord. Highrs.
For conspicuous gallantry and devotion to duty in an attack. When the Tanks on his front were disabled and his company was exposed to close range fire he rallied his men in a most critical situation, and by his skilful dispositions undoubtedly saved many casualties. He sent in a most valuable report to his commanding officer, and showed the greatest coolness and courage throughout."
London Gazette 22 July 1918

In December 1917, the 7th Battalion were in France. They came out of the line on the 16th and marched to Fremicourt where they spent the next six days drilling, bathing and practicing bayonetting, rapid loading, wiring, bombing and bolt drill. On the afternoon of the 22nd they moved to Loch Camp, just west of Fremicourt. On the 23rd the war diary reported:

"Between 5.30 pm and 6.30 pm several enemy aeroplanes dropped bombs on Fremicourt and on the camp, wounding Lt. Yule, and four other ranks."

Lieutenant Yule died in a nearby Casualty Clearing Station at Grevillers two days later.
His wife, Jane Neilson Yule, chose his inscription - 'Peace with honour'. The phrase means peace secured or maintained without loss of national honour. It was used by Prime Minister Benjamin Disraeli in 1878 when he and his Foreign Secretary, Lord Salisbury, returned from the Congress of Berlin to a hero's welcome. Cheering crowds accompanied Disraeli and Salisbury from the train station back to Downing Street from where Disraeli addressed the crowd, telling them:

"Lord Salisbury and myself have brought you back peace, I hope, with honour, which may satisfy our Sovereign and tend to the welfare of the country."

It became a famous tag, not just for the Treaty of Berlin but for other international treaties, especially the Munich Agreement of 1938, which bought Europe a valuable year of peace before the outbreak of the Second World War. For Mrs Yule, her husband had secured his own peace - his death - with honour - by dying for his country
The War Graves Commission's records state that Yule served with the 2nd Battalion Gordon Highlanders but not only is Yule mentioned by name in the 7th Battalion's war diary but the 2nd Battalion were in Italy at the time of his death.