What does 1 Chronicles 27:8 mean?

Eighth in line was Sibbecai from Hushah, from the Zerah clan. He led his group of twenty-four thousand soldiers that month. 1 Chronicles 27:8 - Modern Text Bible

(This verse lists Sibbecai as the eighth commander in a rotation of military leaders, each responsible for a division of twenty-four thousand men for one month out of the year.)