At military academies one studied battle tactic is that of the flanking maneuver. While there are variations, one of the forms taken is that of a “Pincer” where one force double envelopes an opposing army on both sides and then effectively crushes them in the middle.
The classic historical example was the use of the tactic by Hannibal in the Second Punic War against the Romans at the Battle of Cannae on August 2, 216 B.C.E. By drawing in the enemy and wrapping his forces around them to their flanks, by day’s end Hannibal’s men left 50-70,000 Roman soldiers lying dead in battle and nearly collapsed the then-tottering Roman Empire.
The Carthaginian Army lost only about 6,000.