Just for Fun (but the Ox Cart would be a Nice Piece to Have):
From a Letter from Lord Loudoun (on Ship) to General Daniel Webb (Albany); June 20th 1757. Lord Loudoun is the commander and chief in North America. Loudoun plans to move against Quebec City via the St. Lawrence, but he is blocked by a French Fleet and his army is beached at their assembling point in Halifax, Nova Scotia for the entire campaign season. Webb is the British general is charge of the "New York/New England' front. Much has been written about Webb's failure to relieve the siege on Fort William Henry (August 1757). The large mortar is a 13-inch, which is a huge artillery piece for the time. The vast majority of guns available to Webb are iron, not brass. The British may have had 4 brass 6-pounders and 2 brass 12-pounders split between Fort William Henry, Fort Edward and Albany. Both the British and French have smaller mortars available (up to 10-inch), but this 13-inch is about a big as they get for the period. This 13-inch was at Fort William Henry in the summer of 1755 and 1756, but was moved south in late 1756 (probably by Loudoun).
"Your Brass Guns and Your large Mortar are I presume still at Albany; the Guns easily moved and two Ox carts brought down the Mortar: the moment you move that the Enemy will be informed of your Intentions, therefore, I would leave that to be among the last things I did.'"
http://www.archive.org/stream/militaryaffairsi00cumb#page/370/mode/2up
French Mortars
http://www.napoleon-series.org/military/organization/c_mortars.html
From a Letter from Lord Loudoun (on Ship) to General Daniel Webb (Albany); June 20th 1757. Lord Loudoun is the commander and chief in North America. Loudoun plans to move against Quebec City via the St. Lawrence, but he is blocked by a French Fleet and his army is beached at their assembling point in Halifax, Nova Scotia for the entire campaign season. Webb is the British general is charge of the "New York/New England' front. Much has been written about Webb's failure to relieve the siege on Fort William Henry (August 1757). The large mortar is a 13-inch, which is a huge artillery piece for the time. The vast majority of guns available to Webb are iron, not brass. The British may have had 4 brass 6-pounders and 2 brass 12-pounders split between Fort William Henry, Fort Edward and Albany. Both the British and French have smaller mortars available (up to 10-inch), but this 13-inch is about a big as they get for the period. This 13-inch was at Fort William Henry in the summer of 1755 and 1756, but was moved south in late 1756 (probably by Loudoun).
"Your Brass Guns and Your large Mortar are I presume still at Albany; the Guns easily moved and two Ox carts brought down the Mortar: the moment you move that the Enemy will be informed of your Intentions, therefore, I would leave that to be among the last things I did.'"
http://www.archive.org/stream/militaryaffairsi00cumb#page/370/mode/2up
French Mortars
http://www.napoleon-series.org/military/organization/c_mortars.html