I'm not aware of any war involving France around 1850.
These are all civil registration records (after 1792)
When Eugénie Coralie Roseau is born, dad is 38 and mum 25.
Bollezeele p. 1127/1129 23 Nov 1857
Xavier Ambroise Matton, age 60, no occupation (+ someone else) registers the death of Louis Napoléon Matton, age 4, born and residing Bollezeele, son of Xavier Ambroise Matton and his wife Catherine Smagge, no occupation, both residing Bollezeele. Death occurred the previous day at the boy's parents' home. (French death records don't show a cause of death)
Bollezeele p1091/1129 9 Mar 1857
Birth registration of Charles-Aimé Matton, born the same day at his parents' home section B of this commune, "sur la place" (town square), to Xavier Ambroise Matton, 59, no occupation, born and residing Bollezeele, and his wife Catherine Smagge, 35, "ouvrière", born Buysscheure.
Informants : the father
+ Pierre François Louis Devos, 37, ouvrier cordonnier (shoemaker), child's first cousin
+ Louis Deberre (not related)
p69/892 21 Nov 1859
birth Louis Auguste Matton born Rue de Watten, section B, the same day
Father Xavier Ambroise Matton, 63, ouvrier, born and residing Bollezeele, mother Catherine Smagge, 39 born Beysscheure.
p219/892 20 May 1862
birth Marie Louise Joséphine Matton, rue de Watten section A the same day.
Father Xavier Ambroise Matton, 66, ouvrier, born and residing Bollezeele, mother Catherine Smagge, 41, ouvrière, born Beysscheure.
Witnesses not related.