Photographic evidence exists of at least one Union 13-inch siege mortar mounted on a rail car during the Siege of Petersburg.

From the 18th to the early 20th century, very heavy siege mortars were used.

For the 8-inch siege mortar at a range of 800 yards, about 50% of the shells would fall within a 50-yard radius of the target.

With the 10-inch siege mortars at 875 yards, about 60% of the shells would fall within a 40-yard radius of the target.

The siege mortars were then moved forward to be trained on the western forts.

There's another fort there that commands the only passage, it's got heavy siege mortars.

Studies began on using Little David as a siege mortar.

Boaz and Unk, moreover, were made Siamese twins by the long tube of a six-inch siege mortar which they were carrying between them.

The company mother ship, though it would, through a logistical fluke, be carrying the tube of the siege mortar, was essentially a noncombat ship.

He picked up his end of the siege mortar's tube.