Artillery owned the battlefield before the advent of air power, and it has frequently been the deterministic factor in regards to which side would win or lose a battle.
Air power changed things dramatically but artillery is still a major, and poweful component of any modern army.
Let's take a look at the manual of arms of a civil war era cannon:
How do you load it?
How do you fire it?
What did it take in regards to manpower and infrastructure to leverage even one of these cannons in the heat of battle?
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If you're interested in a deeper dive and/or more nuanced and accurate discussion about these pieces, you should watch this one from the West Point Department of History as well:
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