Naval Fleet
Armada
noun
A warship squad is a naval fleet or an armada.
かんたい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
敵の艦隊からもっと激しい抵抗があると思っていたので、なんだか拍子抜けです。
I expected stronger resistance from the enemy’s naval fleet, so I’m kind of disappointed.