Fighting tactics of the Roman army, like the tactics of all armies, depended upon the battle conditions. Things such as the number of the enemy, the terrain and even the weather had to be considered. They had several battle formations and maneuvers, which were used in various circumstances. In a very broad sense you could say that the infantry used hand to hand combat as their main tactic with three lines of fighters and the cavalry used a type of herding/chasing tactics.

The Infantry traditionally utilize two formations, the file and the wedge.

Wisdom, battle strategies and tactics and crafts

The range and accuracy of both musket and field cannons improved much since the revolutionary war (80 years prior) , however infantry tactics had not kept pace with these advances in weaponry.

Yes , heavily armoured Athenian infantry were known as Hoplites who fought at the battle of Marathon against the Persians in tightly knit formations known as a phalanx .