[X] "I like the idea of the village. They'd be surrounded and outnumbered."
I prefer the overwhelming ambush from all sides in the village. The surest way of annihilating most if not all of the scum.
A few words regarding the cops.
So, law enforcement does exist of course. It's quite ineffective, but it exists. The local Starosta is the man responsible for the execution of law within his Starostwo (administrative unit, something like a County). Since the Starosta is usually some magnate or other rich noble that has better things to do, de facto the work is being carried out by his subordinate, a Podstarości, Wicestarosta, Burgrabia (sometimes called Murgrabia), Starosta Jurydyczny, Podwojewodzi... depends on the region of the Commonwealth. For Lithuania, it would be a Podwojewodzi (Vicepalatinus) or Podstarości (Vicecapitaneus) with the latter being a universal option for nearly the whole country. Think of him as the Sheriff, who has a few pleb Deputies to his name (Pachołkowie Starościńscy, Starosta's Men/Servants), that can count anything from half a dozen to a couple of dozens. They uphold the law, enforce court verdicts, guard the peace on the roads, etc. Before he and his men can do anything to a landed noble, there is a long legal fight (unless he was captured within 72 hours of committing a crime)... not so much with a poor nobleman without any land. Even then, the man usually has to send for help to other local noblemen to assist him with manpower in executing the law, if the perpetrator refuses to adhere to the courts... so yeah, it's a shitshow. Towns and cities keep town guards of course as well, but they cannot touch a nobleman, unless he causes trouble right in front of them.
Now, when it comes to noble brigands, if they have a banishment (exile, they have to leave the country) or worse, an infamy sentence to their name, they are screwed if captured. These verdicts were usually given in absentia, since many noblemen ignored the courts and never went to the hearings (and with the death penalty on the line in the more severe cases, who can blame them?). A banished noble, if captured, lands in prison but still has his privileges intact, therefore he cannot be killed on a whim. Infamy however, means that the noble loses all privileges and any man who kills him can do so without any repercussions and can expect a reward for his troubles from the authorities (and a banished noble who did the deed can have his banishment revoked). Also helping a infamis in any way (even giving him water) condemned the accomplice to the same status. In practice, you have to capture the man to enforce these laws. Some had magnate protectors that defended them from the courts and their verdicts (the infamous troublemaker and murderer Samuel Łaszcz had dozens of banishments and infamies to his name, yet was untouchable because he was protected by Hetman Stanisław Koniecpolski, since he was also an excellent soldier and leader in times of war; Koniecpolski needed such good men to fight the Tatars and any other enemies). Still, the raid itself is crime enough even if nobody had a sentence before and if captured by the law the attacker would have been subject to quick execution without a trial, since he was caught red-handed.
Some places do, however, execute the law with extreme impunity. The Royal court and the vincity of the monarch within the radius of a few miles are sacrosanct and anyone causing trouble or starting a fight there is subject to a very brutal crackdown and summary execution. The same will be with the Tribunals in the future, but they haven't been created yet (Court of Appeals for the Crown and Lithuania).
The interregnum itself is a time, when being a troublemaker is a bad idea. The regular Courts ceased to function (since they passed judgement in the name of the King, who was now dead). Kaptur (Hood) Courts were elected by each local Sejmik and worked in their stead during this time. The name came from the classic black hood used by executioners when perfoming the job. The Starostas and their men were subject to their whims. The Hood was a criminal court only and was surprisingly quick and effective at passing merciless judgements on anyone disturbing the peace during interregnum. There was a path of appeal to the General Confederation (the General Hood) but most brigands were summarily executed if they didn't have a magnate behind their back. The new King had to formally confirm all of the sentences of each Hood after his election.
Phew.
With all this in mind, back to our situation. The dead are dead, therefore no courts for them, no matter what they had done in life. If the village is owned by a private individual that cannot help for whatever reason (and he doesn't live there, since then his manor, servants and family would have been raided too and that implies he owns more than 1 village, making him a fairly rich man and a member of the middle nobility or a magnate), then he will be grateful to whomever saves his property from brigands. Whether it is a Radziwiłł force, a Starosta or whatever. Unless of course he has some beef with his saviour, who might use this opportunity to take over said village and lands by force (which was not so uncommon, especially for the rich and mighty). The local peasants (and administrator if present) of course will ask anyone for immediate help if available, therefore it would not be unreasonable for a passing troop to rescue them for a myriad of reasons, be it compensation, honor or anything else. The leader does accept the risk however for the situation and for his men, since they are in the employ of his master and should he be displeased with their intervention or its consequences, it may cost him his job or worse.
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A few more notes:
Ukraine was by far the most lawless place of all, given its vast space, lack of law enforcement, frontier manners, Cossack and Tatar troubles and powerful magnates rulling the more civilized parts, waging a war with each other. It was the favourite destination of troublemakers, exiles, bandits, as well as men looking to earn their fortune. It's been sometimes called the Polish Wild West (or East in this case).
Each local Hood, as well as the General Hood enforced the peace using their own forces. Should they rely on Starostas alone (since they had no authority during interregnum, being enforcers of a dead King), they would have been as ineffective as them. Hoods raised their own troops using private money (the nobles themselves, their men, hired men, etc.) and used them to keep the peace, then disband them after the election was done. The General Hood had quite the force at its disposal to guard the election Sejm, so that Lord Firlej or anyone else would be disinclined to do something stupid there. Add to the mix the Hood Courts, that executed troublemakers without mercy (and very fast) and you have a country that was much safer during interregnum, than in times when there was a King on the throne!
In general, we can summarize the law and its enforcement in one short quotation.
"Every man in the Commonwealth is his own master, so long as he holds a sabre and can gather some men to his name."
The biggest stick rule mostly applies.