What is the ruling on the commander of the battalion and his assistants who tortured a man, not affiliated with the battalion, to death, on suspicion of stealing a wooden car? Is their act considered intentional killing or semi-intentional, and what are the consequences for them?

Torture is generally forbidden, as it has been authentically reported from the Prophet, may Allah’s prayers and peace be upon him: "Indeed, Allah will punish those who punish people in this world." It is not permissible to torture the accused unless he denies the truth after it has been established against him.

As for determining the type of killing (intentional or semi-intentional), it requires details not present in the question. Whether the killing was intentional or semi-intentional, if it was unjust, then the sin, retribution (qisas), blood money (diyah), and expiation (kaffarah) are shared by the leader and everyone who participated in causing the death.

If a group conspires to kill a person, all of them shall be killed. If individuals cause travelers to be prevented until they die of thirst, then the ['aqilah] (male relatives on the father's side responsible for paying blood money) of those who prevented them must pay their blood money, and each man among them must offer expiation for each life, in addition to discipline [adab].

The expiation is freeing a believing slave. If one cannot find one, then he must fast for two consecutive months, along with repentance to Allah Almighty.