The cannon's preparation time for each round of firing was simply too long, even now that Suo Lun's artillerymen were sufficiently skilled, it still required about six or seven minutes.
By the time the breech-loading quick-firing cannons arrived, that would be the true good tidings.
Suo Lun fantasized in his mind, if he had hundreds of breech-loading quick-firing cannons, all using cartridge ammunition, and with the successful development of high explosives. That would guarantee the ability to kill off these hundreds of thousands of people completely.
If he had Maxim guns, not too many, just one hundred of them would do! Suo Lun dared to guarantee, that in just a few hours, he would be able to kill off these four hundred thousand people completely.
Unfortunately, he had none of these!
Not to mention things like the breech-loading quick-firing cannons and Maxim guns, which in his lifetime, he would never have; even high explosives would be unavailable for a very long time.