renowned throughout Greece for the unrivalled skill which they showed
in working and manoeuvring the trireme. A few hoplites were still
carried, to serve in cases of emergency; but by far the most important
part in the encounter was played by the trireme itself, with its long,
tapering, sharp-pointed prow. To use this deadly but delicate
instrument with effect required great coolness, dexterity, and
judgment, on the part of the steersman, and a crew under perfect
command. The tactics usually employed were as follows: watching his
opportunity, the captain gave the order "full speed ahead!" and
darting rapidly through the enemy's line, wheeled suddenly round, and
drove the beak of his galley with terrible force against the stern or
side of the vessel selected for attack. One blow from the long lance-
like point, propelled by the whole weight and impetus of the trireme,
was sufficient to sink or disable an enemy's ship, and the attacking
galley was then backed away from the wreck, and directed against
another victim.

The incessant practice of nearly half a century had enabled the
Athenians to attain consummate mastery in this new method of naval
warfare; and they were now to give signal proof of their immense
superiority over the other maritime powers of Greece.

In the same summer which witnessed the investment of Plataea, the
Spartans planned an expedition against Acarnania, the westernmost
province of Greece, which they wished to detach from the Athenian
alliance. A Spartan officer, named Cnemus, was sent off in advance,
with a thousand hoplites, to raise the wild mountain tribes, and led
an attack against Stratus, the capital of Acarnania; and in the
meantime orders were sent round to equip a numerous fleet, which was
to support the operations of Stratus by harassing the coast districts.