At the front of the formation were two units of cavalry on either side of the rest of legionary. The cavalry was very important to the Roman army because they could attack first and lead the legionary into battle and also provide support
The weapons of the Roman army were very important to them being victorious in the battle field as the weapons were well designed and advanced for the time period in which they reigned.
The Gladius was a small sword which was no longer than 50 cm long. The soldiers could use the Gladius when combat was tight and congested to stab enemies. The Pilum was a throwing spear used by by Roman soldiers for killing enemies, but also for throwing at their shields so that they were no longer able to use the shield. It was just over two meters long and could be thrown quite accurately and far by a trained Roman soldier. The pugio was another commonly used weapon within the Roman legionary. It was a 15-25 cm dagger that was carried on the outside of the belt,
Used for close combat like the gladius. Those three weapons listed are the main weapons used for fighting. The armor used was very strong and helped the Romans win battles because of how protective it