It is always a shame when a country's soldiers cross the borders. All we can do is mourn our dead people, never forget them, but also not burst out in hatred toward each other. In the german language there was a word for the hatred between french and german Volk. Erbfeindschaft must not be resurrected. I have as much respect for a french soldier as i have for a german or any other peoples.
We (and especially the people who decide in this world) have to stop meddling all over the world and return to a peaceful state. Following the ten commandments would be a good start, even if one isn't religious.
In many ways, the soldiers were victims as well. They were pawns in the hands of the powerful, and paid with their lives, their limbs, their sanity.
We must bury the hatred with the dead and lay the foundations for an Erbfreundschaft.