I have recently been researching on Korean history (I'm Korean American) and one person that really stuck out to me was Yi Sun-sin. From the amount of sources that back it up, there is no doubt that he was an amazing naval commander. However I have a few questions about the credibility of these numbers.

I saw in one of his major comebacks, he was able to defeat a Japanese Navy fleet of about 200 ships (or more) with just 13 ships. No matter how great of a commander one may be, I feel like this really pushes the limits and just may have been written to make him look bigger. Did this really happen or more likely exaggerated?

Was there a possibility of error for these ways of executing people?

What would happen to me ? (other than getting killed like everyone else...)

(Turn of the century meaning circa 1900) By "what work could she do" I mean, could she expect to perform, conduct, travel to do those things, publish music, and teach? In what ways would her musical output be different from a man's of the same time, due to limitations in her rights and social permissions? Were some musical forms seen as more appropriate for a woman of this time over others?

I have been looking for what went on and how it is connected to the cold war and how the U.S or USSR were involved

This question was inspired by Tacitus. The Roman empire having historians means there must have been significant development in the historical method since then?

Is this an easily answerable question? Did historians of the past focus on specific things? Were these societally inspired values?

I'm sorry of this is too broad a question, mods feel free to remove it if it is. For specificity maybe a compare and contrast of ancient history versus post-Enlightenment history?

Were there unique advantages associated with converting to Christianity as opposed to keeping paganism?

EDIT: Thank you so much everybody for the excellent answers!

Historians of the Reddit-sphere, good day, what was the Vietnamese military like? What were their tactics, who were their ancestral enemies, were they often conquered or did they manage to function as an independent state for most of their existence?

When did it first come around and who started it? Is there even any record on this type of stuff? Is it a recent thing or has it been around for a long time?

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I know that in Virgina, the geographical barriers between east and west prevented the flow of goods and that the western half always had commercial ties to PA, OH, and KY. Is there any specific mention of Pittsburgh and the ramping up of its metals and armaments industries for the war as a reason to secede/stay?

Most ancient apocalyptic prophecies of which I am aware regard the end of the world as essentially positive, if temporarily unpleasant. However, most contemporary imaginings of the apocalypse (which tend to skew more technological than religious) view it as something which must be avoided or overcome rather than as something necessary for the purification or renewal of the world. When and why did this shift occur? Were there ancient prophecies which had a wholly negative view of the apocalypse? Apologies if this treads a bit on the twenty-year rule.

I'm curious how cavalry changed in its usage from a pre firearm era to the use of musket& bayonet infantry. Any good sources would be appreciated.