Spain is much harder than Numidia. Numidia is easy, the only country near you is carthage, the weakest AI faction in the game. With Spain, you start off near gaul, who outnumber you and have better troops. I'm having trouble with Spain on easy! Numidia I played normally, and didn't have any real major problems.
Just don't build any troops the first couple of turns, except where vital, and build trade related buildings.
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