Entry from Hotel des Invalides

[Zefiro]

It's always good to get actual French speakers to look at these entries. 

I do speak French, but it is not my mother tongue

[goldie61]

Good enough for me then Zefiro! 

[Isabel H]

I would translate it as follows:
His leg was broken/ smashed/ shattered following an explosion of a mine. (Allthough I don't know if devices like that existed at that time).
If this had happened in a mine, the French text would have had at least the preposition 'dans'.

That is how I  translated it too, but it seems it was too early for the explosive devices we now think of as mines. However, we were close. I found a dictionary online of 17th century French, which defines "mine" as "work carried out underground beneath a bastion, ramparts or boulders to shift them by means of gunpowder".

[Zefiro]

Thank you for this info.
So both translations probably are correct: it happened underground and there was an explosion.

[goldie61]

Good find Isobel. 
Many thanks for the explanation.