What is an armanda
-soldiers armed with bows and arrows
-an army led by priests
-a large fleet of warships
-any invading military force

Right choice is:

A large fleet of warships.

Explanation:

Look at the famous historic example. In 1588, Spain´s king Phillip II sent an invasion force to invade England by sea. The formidable force had hundreds of ships and carried soldiers, horses, supplies, canons and other stuff. The naval force was called the "Armada Invencible" or the Invincible Armada. So, an armada is a large fleet of warships.

a large fleet of warships

Explanation:

Use an example e.g Spanish armada between Britain and Spain where both countries have a full war against their warship fleets which the British destroys most