You're right, Theseus, I was bascially stuck in the mindset of my original post (waiting 30 or so turns until MT has been researched). I still contend that without MT, the marine assault is only about half as effective due to not being able to press it inland. On the other hand, all those Cavs are about to be obsolete, so why not throw them onto some infantry guns and see if you can take a city or two that way... at least to stay on the offensive until the tanks arrive
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