Nehemiah 4:16-18

From that day on, half of my servants carried on the work while half of them held the spears, the shields, the bows and the breastplates; and the captains were behind the whole house of Judah. Those who were rebuilding the wall and those who carried burdens took their load with one hand doing the work and the other holding a weapon. As for the builders, each wore his sword girded at his side as he built, while the trumpeter stood near me.