The answer is: They were all left-handed

Jdg 20:16

The mention of the 700 left-handed Benjamite soldiers is a fascinating detail nestled within the Book of Judges, showcasing time-honored skill in a striking way. This left-handed attribute surely stood out not just for its rarity, but also for its strategic advantage! In a world where right-handedness was the norm (in fact, the majority of people are right-handed), these slingers occupied a unique spot. Their distinct proficiency in using the left hand meant they could catch their opponents off guard. It turned heads—and arrows!

In ancient battles, warriors from the same tribe usually fought side by side, thus the left-handers’ approach would present confusion to their enemies anticipating faces using weaponry predominantly from the right. Picture this scene: as they prepared for battle, their enemies might have expected opponents to interact as expected. Instead, the unexpected trajectory of a left-handed sling bullet could take enemies by surprise!

Also, interestingly enough, the term “Benjamite” comes from the name of the youngest son of Jacob, who was favored and gifted by his father, stirring the whole tribal dynamic. Their contribution to Israel's military prowess reminds us of the importance of diversity in strengths and skills—just as being "left-handed" isn’t an obstacle akin to being right-handed either. In essence, this unusual band embodies how unique talents can reframe a challenge—and isn’t that a great reminder for all of us?