[Nowhere Man]

You could probably defeat Rome even using World War I technology, just imagine what a Liberty tank could do (although made for WWI, they came out a little too late) or even a Sopwith Camel/Pup with machine guns or even a guy tossing a stick of dynamite over could do. If you add in some Zeppelins and infantry of course, you're ready to go.

One useful thing our Marines would have is portable tactical radios although even by World War I standards, radio would be a plus.

[ken5050]

Marines would AVOID a pitched battle..conserve ammo, fuel, and spares. Romans would be terrified...you send ONE tank into the Roman senate, call in ONE Harrier to fly overhear, launch ONE missile, ONE tank round, and tell the Emperor and the Senate to surrender, or else...

Then the Marines learn Latin, and teach the Romans about democracy..marry their women..