How many letters does the top answer for “(military) an offensive against an enemy (using weapons)” have?

The most common answer is attack (6 letters).

Crossword clue: (military) an offensive against an enemy (using weapons)

3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

attack 6 letters wn-def

launch an attack or assault on; begin hostilities or start warfare with

onrush 6 letters wn-def

(military) an offensive against an enemy (using weapons)

onslaught 9 letters wn-def

(military) an offensive against an enemy (using weapons)