Were they breech or muzzle loaders? pin.it/3X2hPSt
I can't find anything online about this weapon, the 240mm mortar, could reach out to 2,000metres, I'd assume this beast could do better than that.
My question would be how they actually managed to fire the thing. OK,the bomb is trundled up on its trolley and is loaded into the barrel. Its too heavy and the loading angle too shallow for it get very far in. The crew then have to crank up the barrel (with its heavy live bomb at the sharp end) to the firing position indicated on the pictures of the kit. How can they have any certainty when the bomb will start to slide down the tube and engage with the firing pin? Unless there's some mechanism to lock the bomb in place while they're doing this and setting the range, it looks to me like a recipe for chaos!