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This is coolbert:

"Direct fire or line-of-sight fire refers to firing of a ranged weapon whose projectile is launched directly at a target within the line-of-sight of the user."

"Indirect fire is aiming and firing a projectile without relying on a direct line of sight between the gun and its target, as in the case of direct fire."

Direct fire you see what you shoot at. Indirect fire you do not see what you fire at.

From the Internet web site isegoria.net and as extracted weapons systems normally direct fire only being used extensively in the indirect fire mode.

"Ukraine uses artillery fire as a long-range sniper weapon"

May 16th, 2023.

"Increasingly drone-enabled Ukrainian tanks are acting in an indirect fire role, engaging Russian armor beyond normal combat ranges and beyond line of sight. In August 2022, a video posted on social media showed a Ukrainian T-64BV destroying a Russian tank at a claimed range of 6.5 miles [about ten Km.], which would make it the longest ever tank vs. tank kill. This required some twenty 125mm projectiles, but the Russian could not fire back to the ‘duel’ was entirely one-sided."

[…]

"Older, supposedly obsolete weapons are being transformed into effective indirect-fire platforms. Videos show 100mm T-12 Rapira anti-tank guns dating from 1961 in this role, and even a T-12 mounted on an MT-LB tracked vehicles. The 73mm SPG-9 recoilless rifle (from 1962), again originally a direct-fire anti-tank weapon, is being also used for precision indirect fire, as is the AGS-17 Plamya 30mm automatic grenade launcher."

Weapon systems of all types normally direct fire only now can use the indirect mode of fire thanks to drone video feed providing data necessary for aiming correction to be made.

Necessity is the mother of all invention?

coolbert.