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There are Three Tables:
gun_types
The 2nd column, Type, refers to a battle_entity in battle_entity table.
The last column refers to an engine animation in animation_tables.txt.
units_tables
The 4th column, Class, refers to unit_class in unit_class table.
units_stats_land
Artillery 1 column. This refers to Gun ID in 1st column of gun_types table.
There are columns that determines cavalry battle entity, horse1, horse 3, carriage battle entity, ammo train battle entity, ammo caisson destructed, and ammo caisson destruction.