The Roman soldier had three main weapons. A shield, a sword and 1-2 javelins.
The shield (scutum)
The standard scutum most people associate with the Roman Legions of the 1st Century was semi-cylindrical in shape, large enough to reach from the shoulder to the knees and protected half of the body. It was light enough to be carried on a long march and in heavy battle. Imperial scuta (pl. of scutum) was made of layers of thing wood glued together (just like modern plywood). Each layer was glued at an angle to the previous one for strength. The edge was bound with light sheet bronze or leather and the central boss (umbo) was heavy bronxe or iron.
As no intact shields from this time period have been found thus so far, we can only assume that the shield a hand grip and an inner strap enabled the soldier to hold the shield close to his body and also leave his other arm free for other weapons. Most research seem to point to a horizontal grip, this being inferred by an intact scutum from Dura Europas, but it was 3rd Century.
This was 18 inches long, 2 inches wide and narrowed towards the centre. It had a bone handle shaped to the soldeir's hand and a large a alrge round ball at the end to help with the balance.. It was not designed for hacking, more for thrusting forward ito the enemy's body. It was very light and so meant that it could be uesed in a very fast manner when stabbing at opponenets.