The Phalanx one is good but:
1. 'Oat of the Mist' - bit of a fail
2. (in the words of Darios):
The soldier on the pic is a Greek hoplite but he is carrying the shield of a Roman legionnaire.
Greek hoplites used the circular shield called a "hoplon." That's why they are called "hoplites" in the first place. Hoplites fight in a phalanx, that's basic history.