A battery is six guns, rapid firing at 20 seconds once dialed in, so to get the same blast effect in total, you'd need 2-3 minutes with all six guns firing.
The difference is that the overpressure and blast energy of the 2000 pounder is concentrated in a fraction of a second, and the mass of the explosive and air gives you a higher total overpressure and a shockwave that's much stronger. Sound effects will be 20-30 dBa higher at a minimum, etc.
WW2 is an invalid comparison - the relative expense, tactical control and ground coordination, and time to target of close air support was much higher. The USMC also relies heavily on close in air support - that's why they have their own independent aviation branch, whereas the US Army is limited to rotary aviation, and has to call the Air Force for it's close support.
The difference is that the overpressure and blast energy of the 2000 pounder is concentrated in a fraction of a second, and the mass of the explosive and air gives you a higher total overpressure and a shockwave that's much stronger. Sound effects will be 20-30 dBa higher at a minimum, etc.
WW2 is an invalid comparison - the relative expense, tactical control and ground coordination, and time to target of close air support was much higher. The USMC also relies heavily on close in air support - that's why they have their own independent aviation branch, whereas the US Army is limited to rotary aviation, and has to call the Air Force for it's close support.
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