Yes.
tuhy
Small arms, machine guns, mortars, artillery, mines.
Pistols, rifles, machine guns, mortars, artillery and other cannon.
they were stuck in the trenches and were fired out to hit the Enemy
The Trench Mortars effected the World War 1 (WW1) by giving an advantage to the users by being able to keep cover and still be able to shoot over and hit or at least hit the ground near the enemy's trenches to force then to move.
Catapults have long since been replaced by mortars and artillery. Technically they still could have been built during the world wars but they were not used in combat to the best of my knowledge.
Mortars
Yes. Mortars are used by vitrually every army in the world.
Mail Call - 2002 Mortars WWII G'I's Personal Items Native-American Arrows 1-6 is rated/received certificates of: USA:TV-PG
The following numbers include ALL belligerents. Tanks, 279,670; Artillery, 1,094,823; Mortars, 1,030,802; Machine Guns, 5,803,347; Trucks, 3,655,213; Aircraft, 822,379. Richard V. Horrell WW 2 Connections.com
Mortars, artillery shells especially shrapnell, hand grenades and rifle grenades.