Nehemiah 4:16-18

16But from then on, only half my men worked while the other half stood guard with spears, shields, bows, and coats of mail. The leaders stationed themselves behind the people of Judah

17who were building the wall. The laborers carried on their work with one hand supporting their load and one hand holding a weapon.

18All the builders had a sword belted to their side. The trumpeter stayed with me to sound the alarm.