The corps/army level artillery mission hasn’t really changed that much since World War I, at least from what I’ve seen.

• Counter-battery
• Deep strike
• Supporting the right effort at the right time.

As always, the Soviets were the most explicit in spelling it out, as one set of field regulations shows.

The American FM 100-15, from a similar time, had a similar statement.

As far back as 1923, the regulations explicitly state:

“The primary mission of corps artillery is the destruction or neutralization of hostile batteries, the destruction of hostile defenses, and long-range interdiction fire.”

As technology has consistently improved, command has “flattened”, and the understanding of its role has become more obviously apparent, more recent documents don’t spell it out so exactly. But the general concept is still there and present.