I've seen the AI do 2 different types of amphib assaults. But its good at neither and rarely does them.

A quick way to see type 1.. is start as hondorus and declare war on the U.S. they will use war ships to clear out your ports and usually land a few troops there. Once they have the port lots of reinforcments come in.
Type 2.. the old version where it uses transports instead of merchant marines is far more rare. But I've seen it happen a few times in my modern world mod.
Both are rare but for different reasons. Type 1 is rare because unless the defending nation has almost no military or the Attacking nation has overwhelming naval force the ports are never cleared for merchant marines.
Type 2 is rare for a multitude of reasons.. The AI prefers merchant marines over transports, Transports that are big enough to carry large contigents are rare in the 1949 starting date and of course the AI has never been very keen on these types of Assaults anyway.
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