Well, the AI does one or two moves a day unless you attack it, it probably expects you to do the same (in which case the rockets become effective). And a bunch of rockets would destroy anything, surely....even in S1914, tanks, while strong, are perhaps not the best choice, but it is their insane strength which makes them the AI's choice. The AI simply does not consider unit-to-unit effectiveness.....it will send tanks on the water against battleships (which makes us lol).
"Om Namah Shivaya....Aham Namah Shivaya"