About French units of
Former French units of measure are
conserved in the text because it's impossible to give them a
real translation. Sometime they are converted in meter or
centimetre and their value are placed between brackets.
ligne = 0,225 cm
pouce = 2,707 cm
pied = 32,5 cm
pas = 2 pieds 6 pouces = 97,5 cm
toise = 6 pieds = 195 cm
The regulation of
The siege artillery was composed of heavy
cannons with large calibers 33, 24 and16-pounder guns and
The mortar was a piece that fired with a weak powder charge
a spherical shell filled with a powder bursting charge. The
shell projected along a curve path over the defence was
designed to burst into many ragged around its fall point,
dispersing personnels of defence and allowing assailants to
advance to short distances.
On the same principle the pierrier projected against the
enemy a basket filled with stones, but with an efficiency
well inferior than mortar they were less
In 1732, Lavallière in his reform
of the artillery precised the dimensions that casters had to
follow for the five pieces of the regulation.
- 8-pouces mortar with a cylindrical chamber containing a
powder charge of 1 3/4 pounds.
- 12-pouces mortar with a cylindrical chamber containing a
powder charge of 51/2 pounds.
- 12-pouces mortar with a pear chamber containing a powder
charge of 12 pounds.
-12-pouces mortar with a pear chamber containing a powder
charge of 5 1/2 pounds.
-15-pouces "pierrier" with a curtailed cone chamber
containing a powder charge of 2 1/2 pounds.
Mortier de 12
chambre cylindrique de 5 1/2
Mortier de 12
chambre poire de 12 livres
mortier de 8
pierrier de 15