1 Chronicles 12:2

All of them were expert archers who could shoot arrows or sling stones with their left hand as well as their right. They were all relatives of Saul from the tribe of Benjamin.

Judges 3:15

Then the Israelites cried out to Jehovah. So he sent someone to free them. This was Ehud, a left-handed man, who was the son of Gera, from the tribe of Benjamin. The people of Israel sent Ehud to King Eglon of Moab with gifts for him.

Judges 20:16

Besides these, the citizens of Gibeah gathered seven hundred specially chosen men who were left-handed. Every one of them could sling a stone at a strand of hair and never miss.

1 Samuel 17:49

He put a rock in his sling and swung the sling around by its straps. When he let go of one strap, the rock flew out and hit Goliath on the forehead. It cracked his skull. He fell facedown on the ground.

1 Chronicles 12:29

From the tribe of Benjamin, Saul's relatives, there were three thousand warriors. Most of the men from Benjamin had remained loyal to Saul until this time.

Treasury of Scripture Knowledge

Summary

They were armed with bows, and could use both the right hand and the left in hurling stones and shooting arrows out of a bow, even of Saul's brethren of Benjamin.

In hurling

Bible References

Could use

Judges 3:15
Then the Israelites cried out to Jehovah. So he sent someone to free them. This was Ehud, a left-handed man, who was the son of Gera, from the tribe of Benjamin. The people of Israel sent Ehud to King Eglon of Moab with gifts for him.
Judges 20:16
Besides these, the citizens of Gibeah gathered seven hundred specially chosen men who were left-handed. Every one of them could sling a stone at a strand of hair and never miss.

In hurling

1 Samuel 17:49
He put a rock in his sling and swung the sling around by its straps. When he let go of one strap, the rock flew out and hit Goliath on the forehead. It cracked his skull. He fell facedown on the ground.