Ancient Greek Troop Formation With Shields
Puzzle 12 of Periodic Table Medium Pack
Question is: Ancient Greek Troop Formation With Shields
and the answer is: PHALANX
Word Meaning:
PHALANX — (historical, plural phalanxes) An ancient Greek and Macedonian military unit that consisted of several ranks and files (lines) of soldiers in close array with joined shields and long spears.
Definitions from Wiktionary.