[Lucius Cornelius Sulla]

Lee saw the folly of guerilla warfare and the horrendous impact it would have had on the Southern population

He certainly knew of the horrors going on in Missouri, which was essentially a guerilla war, so did not need to imagine it.

[Non-Sequitur]

He certainly knew of the horrors going on in Missouri, which was essentially a guerilla war, so did not need to imagine it.

And if Lee needed a reminder then he didn't have to look any further than Kansas. When it came to the border war, neither side could claim any moral high-ground.