en_tn/act/21/34.md

the captain

The military officer or leader of about 600 soldiers.

into the fortress

A fortress is a heavily protected building used by the military.

when he came to the steps, he was carried

"when Paul came to the steps, the soldiers carried him" (See: rc://en/ta/man/translate/figs-activepassive) The soldiers physically picked up Paul and took him up the stairs.

away with him

"put him to death." The crowd is using polite language to ask for Paul's death. (See: rc://en/ta/man/translate/figs-idiom)