Myrmidon

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Greek Mythology A member of a warlike Thessalian people who were ruled by Achilles and followed him on the expedition against Troy.
2. n. A faithful follower who carries out orders without question.

Century Dictionary and Cyclopedia

1. n. One of a warlike ancient Greek people of Phthiotis in Thessaly, over whom, according to the legend, Achilles ruled, and who accompanied him to Troy.
2. n. [lowercase] A devoted and unquestioning or unscrupulous follower; one who executes without scruple his master's commands.

Wiktionary

1. n. One of a fierce tribe or troop who accompanied Achilles, their king, to the Trojan war.
2. n. One of a fierce tribe or troop who accompanied Achilles, their king, to the Trojan war.

GNU Webster's 1913

1. n. One of a fierce tribe or troop who accompanied Achilles, their king, to the Trojan war.
2. n. A soldier or a subordinate civil officer who executes cruel orders of a superior without protest or pity; -- sometimes applied to bailiffs, constables, etc.

WordNet 3.0

1. n. (Greek mythology) a member of the warriors who followed Achilles on the expedition against Troy
2. n. a follower who carries out orders without question