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Finally, TF Iron used M-240 and MK-48 machine guns to provide plunging fire and engage the insurgents at long ranges.
The second advantage was that mortars could engage targets in the defilade with plunging fire. Third, mortars were lighter than artillery and could be moved more rapidly.
The overwhelming majority of respondents questioned why the 60mm mortars had to be mothballed; others asked just how exactly a 40mm automatic grenade launcher could replace the short-range, indirect plunging fire of a mortar?
This was because the plunging fire from heavy German guns tended to cause British battlecruisers to explode.
Technically, they were differentiated from guns by their ability to accept variable propellant charges and the provision of high barrel elevation angles to deliver plunging fire against the enemy.