I almost always utilize expansionistic strategy (or some of its blends) when I play.
First of all we're talking about King and Emperor level cause at lower levels it's easy to develop civilization without much expansion.
Now let's consider three possible scenarios :
1. You're on a small island that is big enough to support not more than 4 cities (with a potential to reach the size of at least 14 for each of them - including some ocean squares - without major terrain changes like forest->plains or jungle->grassland, i.e. pretty much just irrigating and building mines and roads).
2. You're on a bigger island that is big enough to support 5 to 7 cities.
3. You're on a big island that is big enough to support 8 to 12 cities.
4. You're on a continent where you can have 13 cities or more.
I will briefly describe what I would do each situation and you're welcome to criticize me.
1. Build a city or two on your island and then sail your trireme with a settler or two to the nearest big island/continent. Develop your homeland cities (or even build one or two more) but use them as a base for further expansion on the big island/continent. Produce settlers/military units there and ship them overseas to expand and conquer. Consider moving your capital to a bigger island once you've got more population there than on your home island.
2. Let's skip this one as I gonna ask you a question about what to do if you found yourself in such situation.
3. Build as many cities as possible on your island and develop them. In parallel, settle on another medium sized island or a hidden corner of a big continent and expand. I would suggest avoiding waging the war (certainly if you have to, do not doubt to crash your enemy mercilessly with a brutal force). The point is that you do not need actually to establish your civilization here (like in scenario 1). If you gonna have at least 5 or 6 cities it would be good enough. And again if you settled in the corner of a big continent and if you feel like you want to expand - do it if you can. In that case you may want to move your capital there later on.
4. The most straightforward scenario - expand as much as possible - stretch your limits - gets as big as possible till city walls, knights and musketeers come to the scene than your chariots would not be as good.
So, and here comes the question : what's the best approach in scenario 2 ?
What comes to my mind is something similar to scenario 3 but with earlier shipping settlers to another island/continent that should be big enough to support at least 8 cities. And than moving your capital there (although it is not a must if you have e.g. 7 + 9 cities).
My main point is that the aggressive expansionistic phase should carried out at the early stage when you can take advantage of :
a. your powerful chariots
b. your yet military weak neighbours can be caught by surprise
Once your neighbours built a lot of phalanxes and city walls, it is almost impossible to defeat them without slowing down your science/city improvements in favour of military units.
And once they've got musketeers, it gets even worse.
No much offensive operations on land till you have armour (that's why science is so important - it'll give you a means to defeat your enemies in the modern age war).
I'd rather patrol my shores with a few ironclads sinking anything I can find. If a spotted enemy ship gets away from me I re-group my limited military resources to counterattack just landed enemy units (roads and later railroads are vital for that).
So, anyway what would you do in scenario 2 ?
First of all we're talking about King and Emperor level cause at lower levels it's easy to develop civilization without much expansion.
Now let's consider three possible scenarios :
1. You're on a small island that is big enough to support not more than 4 cities (with a potential to reach the size of at least 14 for each of them - including some ocean squares - without major terrain changes like forest->plains or jungle->grassland, i.e. pretty much just irrigating and building mines and roads).
2. You're on a bigger island that is big enough to support 5 to 7 cities.
3. You're on a big island that is big enough to support 8 to 12 cities.
4. You're on a continent where you can have 13 cities or more.
I will briefly describe what I would do each situation and you're welcome to criticize me.
1. Build a city or two on your island and then sail your trireme with a settler or two to the nearest big island/continent. Develop your homeland cities (or even build one or two more) but use them as a base for further expansion on the big island/continent. Produce settlers/military units there and ship them overseas to expand and conquer. Consider moving your capital to a bigger island once you've got more population there than on your home island.
2. Let's skip this one as I gonna ask you a question about what to do if you found yourself in such situation.
3. Build as many cities as possible on your island and develop them. In parallel, settle on another medium sized island or a hidden corner of a big continent and expand. I would suggest avoiding waging the war (certainly if you have to, do not doubt to crash your enemy mercilessly with a brutal force). The point is that you do not need actually to establish your civilization here (like in scenario 1). If you gonna have at least 5 or 6 cities it would be good enough. And again if you settled in the corner of a big continent and if you feel like you want to expand - do it if you can. In that case you may want to move your capital there later on.
4. The most straightforward scenario - expand as much as possible - stretch your limits - gets as big as possible till city walls, knights and musketeers come to the scene than your chariots would not be as good.
So, and here comes the question : what's the best approach in scenario 2 ?
What comes to my mind is something similar to scenario 3 but with earlier shipping settlers to another island/continent that should be big enough to support at least 8 cities. And than moving your capital there (although it is not a must if you have e.g. 7 + 9 cities).
My main point is that the aggressive expansionistic phase should carried out at the early stage when you can take advantage of :
a. your powerful chariots
b. your yet military weak neighbours can be caught by surprise
Once your neighbours built a lot of phalanxes and city walls, it is almost impossible to defeat them without slowing down your science/city improvements in favour of military units.
And once they've got musketeers, it gets even worse.
No much offensive operations on land till you have armour (that's why science is so important - it'll give you a means to defeat your enemies in the modern age war).
I'd rather patrol my shores with a few ironclads sinking anything I can find. If a spotted enemy ship gets away from me I re-group my limited military resources to counterattack just landed enemy units (roads and later railroads are vital for that).
So, anyway what would you do in scenario 2 ?