The gladius is a short sword, about 2 feet long, used by soldiers in the Roman army. In the hands of trained legionnaires, the gladius was a potent offensive weapon.
Roman soldiers would advance side-by-side with their shield, called a scutum, held in their left hand and a gladius in their right hand. In this position, the sharp tip of the gladius was best used as a thrusting weapon to stab the enemy, aiming for the torso. In ancient times, an abdomen wound was usually fatal.
With a two foot length and sharp double edges, the gladius could also be used as for slashing or cutting. From comments I’ve read, the main use was for thrusting.