How many letters does the top answer for “to change the positions of, as of troops of ships.” have?

The most common answer is maneuver (8 letters).

Crossword clue: to change the positions of, as of troops of ships.

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

maneuver 8 letters web-def

a military training exercise

manoeuvre 9 letters web-def

an action aimed at evading an opponent