How to Say "army unit" in Spanish
The Spanish word for “army unit” is “legión” — B1 level.
English → SpanishB1
nounB1
military organization

Examples
La legión romana marchó hacia el norte.
The Roman legion marched to the north.
Él sirvió en la legión durante cinco años.
He served in the legion for five years.
Las legiones eran la columna vertebral del ejército.
The legions were the backbone of the army.
The '-ión' Gender Rule
Most words in Spanish that end in '-ión' are feminine. Even though it's a military group, you must use 'la' or 'una'.
Accent Mark
The accent on the 'ó' tells you to stress the final syllable. When you make it plural (legiones), the accent mark is removed because the natural stress moves.
Wrong Gender
Mistake: “el legión”
Correction: la legión (words ending in -ción, -sión, or -ión are almost always feminine).
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