(Spoiler) Valiant Hearts, did Emile know about Karl?

Alright, the title is spoiler free and shows a bit what I'm on about.
Now the actual question, which contains major spoilers (Really, if you haven't played the game yet, close this page now and go do so):
When Emile died, did he know Karl was still alive? He thought Karl got killed at the POW camp. As far as I know Emile never got to know Karl was still alive. Maybe I just missed something in the story though. It would be pretty sad if Emile did die with the thought of Karl being dead...
It seems like this is the first question about this game on this site, which is a shame. It really is a masterpiece.
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Why was Emile executed valiant hearts?
In his final letter to his daughter Marie he expresses his hate for the ongoing war and hopes that Marie and her family will find happiness. Sometime later, he is shot by a French firing squad due to treachery against highly ranked French officers. Emile was a good man, he served his country well.What happens at the end of valiant hearts?
Emile is executed, and some time later, Karl and his family (with the newly adopted Walt in tow) visit his grave to mourn him. The story ends in 1917 when the United States officially enters the war and sends its army to Europe to fight on the Western Front.Is Valiant Hearts historically accurate?
But Ubisoft Montpellier decided to take on the first worldwide conflict in the form of Valiant Hearts: The Great War, meshing a beautiful cartoon veneer with very serious (and historically accurate) source material.Is Valiant Hearts a sad game?
Ubisoft's gorgeous take on WWI packs emotion, but the gameplay has us worried. Let's just get this out of the way: Valiant Hearts is a gorgeous and emotional journey through the perilous years of World War I.Valiant Hearts Ending - Youtubers reactions [Spoiler]
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Images: Miguel Á. Padriñán, Ron Lach, A Koolshooter, Maksim Goncharenok