Eventually when Germany invaded Russia in 1941, Cremieux-Brilhac was released and along with more than 100 other French soldiers taken by Canadian ship from the Arctic port of Archangel to Glasgow.
The next day they arrived by train at Euston station in London. There is archive newsreel footage of the party being welcomed by a Free French officer.
Cremieux-Brilhac is sadly not identifiable in the crowd, but he does recognise several of his former comrades.
Looking back on D-Day, Cremieux-Brilhac remembers the “waves of planes flying over London. There were hundreds of them. It was so impressive. We Free French had no doubt that the landings would succeed.”
“It was such a huge privilege for a young soldier like me – just a student really – to have been so close to the heart of decision-making. I knew De Gaulle and all the resistance leaders.
“And then to think it was me personally who wrote the general guidance for D-Day for the whole French population. It is remarkable.”
His secret document he promises to bequeath to the French National Archive. (BBC)