"court martial" — a military court that tries military personnel using military law (which is different than civilian law)
"martial law" — the body of law imposed by the military over civilian affairs which can be declared to replace ordinary civilian law in a time of crisis
By careful early conditioning, by games and cold water, by the rubbish that was dinned into them at school and in the Spies and the Youth League, by lectures, parades, songs, slogans, and martial music, the natural feeling had been driven out of them.
martial = related to soldiers
There are no more uses of "martial" in 1984 by Orwell.