As long as the threat is taken seriously and treated like a real threat so that all resources are brought to bear, I would imagine they could be sunk very quickly.
But hubris is our military's biggest Achilles heel and no one ever seems to learn from past mistakes. Our military is second to none but anyone who underestimates and scoffs at their opponent has always been in for a bad surprise.
"Indians with bows and arrows? Get real..." (said Custer).
"Stupid Japs, we'll lick'em in a week."
"Bunch of f*ckin' Vietnamese can't hurt us."
And so forth...
We eventually kick ass but not before getting a lot of Americans killed needlessly.
Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!
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