Sling used in War
Source: Nav
Judges 20:16
Among all these soldiers there were 700 select left-handers, each of whom could sling a stone at a hair without missing.
2 Kings 3:25
They destroyed the cities, and each man threw stones on every good field until it was covered. They stopped up every spring and cut down every good tree. Only Kir-haraseth was left with stones in place, but men with slings surrounded it and attacked it as well.
2 Chronicles 26:14
Uzziah supplied the entire army with shields, spears, helmets, armor, bows, and slingstones.