I prefer normal or quick speed, continents mostly but some random map occasionally.
What difficulty are you playing? And what strategy are you using when trying to take a city?
Catapults/trebuchet to soften the city defense while letting melee units withstand the city's attacks is usually a working strategy early on. Of course it depends on what kind/how many units the opponent has. Early sige units are pretty much defenseless in the beginning so you need to protect them with other units.
Sorry if this is too basic, it's kind of hard to give general advice without knowing the skill of the player. I'm no Civ expert myself - played alot but I'm still on King/Emperor
What difficulty are you playing? And what strategy are you using when trying to take a city?
Catapults/trebuchet to soften the city defense while letting melee units withstand the city's attacks is usually a working strategy early on. Of course it depends on what kind/how many units the opponent has. Early sige units are pretty much defenseless in the beginning so you need to protect them with other units.
Sorry if this is too basic, it's kind of hard to give general advice without knowing the skill of the player. I'm no Civ expert myself - played alot but I'm still on King/Emperor