What were Spartan fighting methods?

The Spartans worked in a phalanx: Lines, with shields protecting both the warrior and his neighbour on the left side. They worked well alone, as well. They had three general weapons: a short sWord (Gladius), a spear, and their shield.

"Shield, you say?" Yes! They used it to push their opponents and they snapped bones when they swung the edge.

Exceptional in both formation and one-on-one combat.

Source: Deadliest Warrior