Mortar

A mortar is a long range indirect-fire weapon used to deliver shells of explosives or chemical weapons.

A mortar is used to launch photon grenades. In 2269 the crew of the USS Enterprise (NCC-1701) used photon grenade mortars against the Sackers. 

Mortars were used by the German Nazi Army in World War II during the siege of Stalingrad. The Russian Army used them as well in an attempt to break the siege. 

The designs for the mortar were present in the databanks on the USS Verdun. In 2163 Commodore Lucian Murat had downloaded the designs that were used by the Human forces on Torgu-Va to make this weapon in their fight against the Tarn. Both Tarn and Human forces used mortars to deliver the chemical weapons.