cthia wrote:What are the commerce raiding rules in the Honorverse? Is it lawful to outright destroy freighters instead of capturing? Is that considered a war crime in the Honorverse?
They seem to follow along the approximate lines of the old 'cruiser' rules that were in effect from at least the Napoleonic times through the start of WWI.
The equivalent of unrestricted submarine warfare isn't done (and is presumably a war crime, though I can't recall a specific quote stating that outright).
Warships have such a superiority of speed and weaponry that there's no need to allow them to randomly shoot unarmed freighters without warning.
Though freighters traveling in convoy or under escort, or known to be armed, seem to give up their legal protected state - a raider isn't required to defeat a convoy's escort before firing of the escorted ships.
You don't seem to be required to actually board ships flying your enemy's 'flag' (transponder codes) you can order them abandoned and blow them up after suitible time for lifeboats to get away. If you managed to intercept the ship somewhere there's not a habitable planet nearby you presumably have to take the surrendered crew somewhere safe (which presumably doesn't have to be all the way back to your territory, Taking them and their lifeboat pods/shuttle to a neutral system and kicking them out within range of the habitable planet probably counts)
Of course you can board and seize the ship under prize rules, but then you have to spare the crew to sail it.
The rules didn't change (or get too badly ignored) on Earth until the technology of the submarine (and radio) made the 'cruiser' rules extremely unsafe for the raider. Only the MAlign's spider drive ships
might have that same issue. And right now they're not being used by a known declared combatant so while they might choose to randomly blow up ships in pursuit of their own aims that's not likely to change the accepted rules.