Augustin Trébuchon died at a quarter to 11 on the 11th day of the 11th month, 1918

I remember my brilliant history master Dr Alan White speculating on the last man who died in the First World War just so that the armistice came at 11 o'clock on 11 November and not an hour or two sooner.

The last man who was killed on the Western Front in November 1918, we now know, but didn't when I was at school, was Augustin Trébuchon. 

This is his sad story. He was sent into battle after the armistice with the Germans had been signed. The French army, ashamed, recorded the date of his death as November 10.

The Germans had asked for an armistice on 9 November but it came into effect on 11 November. I should like to know why. Was Dr White right?