Which classification of fire is primarily provided by the mortar section in an attack?

The classification of fire primarily provided by the mortar section in an attack is indirect fire. Mortars are designed to deliver explosive rounds at high angles, allowing them to strike targets that are not in the direct line of sight. This capability enables mortars to engage enemy positions that may be located behind cover or obstacles, making indirect fire an essential tool for infantry during an attack.

In indirect fire, the mortar crew does not need to see the target directly, which is particularly advantageous in complex terrain or fortified environments where visibility is limited. The high-angle trajectory helps to maximize the effectiveness of the rounds, ensuring that explosive ordnance lands accurately on the target despite the distance and obstacles.

On the other hand, direct fire involves engaging targets with weapons that are aimed and fired at a line of sight, which is not the primary method for mortar engagements. Rapid fire refers to the rate of fire and does apply to various weapon systems but does not capture the unique characteristics of mortar fire. High-angle fires can describe the trajectory of mortar rounds, but it does not encompass the broader concept of indirect fire that mortar units primarily provide during operations.