Battles of the late Third Age

[Nilpaurion Felagund]

I don't think the Gondorian fleet would have engaged the Corsairs during the War of the Ring. Think Beregond's words, about a short hand, which can only strike(but strike heavily, yes) when the enemy is in range. Gondor was fighting a defensive war, so they would only engage the ships once they reach land.

And about Thorongil's assault on Umbar, I was thinking more of a Navy Seal-type operation: small vessel to land on enemy harbour, then do as much havoc as they can; burn the ships, kill the sailors, etc. But since Umbar is quite far from the Ethir(and from Pelargir, which I would assume will be their staging area, but I could be wrong) maybe they had help from bigger ships, which would deploy the smaller vessels a considerable distance from the target, and would be the rendezvous point of the returning vessels.

->The Son of Finrod