How much earlier should I attack in a Noble level game?
In general there are several possible attack opportunities:
- directly upon starting the game, a warrior rush, although this is not viable on higher difficulties.
- with an early strong unit, e.g. chariots, axes, horse archers
- with catapults
- (with trebs) I really do not like the late medieval period to wage wars, but it is possible.
- Cannons (+ older units, usually mostly maces)
- Cavs and Rifles+Cannons/Artillery
- Infantry + Cannons/Artillery
- Tanks (+Fighters)
- later stuff
IMHO there are only two unique units that change these things. The others only change details. Not all may be included in vanilla:
- Quechuas, as they shred archers, meaning it is possible to rush deity AIs with them
- Immortals, same but they come later
Basically on higher difficulty levels the advantage the AI gets increases with each era, meaning earlier attacks will be easier. OTOH your economy needs to be able to deal with the additional cities, meaning later attacks can grab more cities more efficiently. Also you will generally start at a disadvantage, meaning you have to catch up, and attack later.
Keep in mind that any AI can be beaten with a sufficient number of Tanks. This is generally faster than teching up to better units and using less of them. I know that at some point in the game Tanks did cause collateral damage (and could get drill promotions!), if this is the case in vanilla, they become even stronger.
If you are on a continent with many AIs or a Pangaea, Catapults are good for getting land. If you have enough land I prefer to tech up to some renaissance units. In BtS I go for Cuirs, in vanilla, Cavs are good if you have a sufficient advantage, else Cannons, as a Cav rush into Rifles is a bad idea. There is no single set time when one should attack, it does depend on the map.
IIRC, in Vanilla Siege units can kill other units. In BtS this is not the case. This means that in vanilla only siege attacks are possible.
Noble is the level where the human player and AI get the same modifiers, meaning the AI bonus does not increase. Still I would recommend you to try out how soon you can reliably take down an AI. Try starting with a Catapult attack on a Pangaea map.
I thought that there may be a penalty for that though, since they don't have the amphibious promotion.
There is a significant penalty, but modern armors having almost double the strength of a marine together with CR promotions more than make up for it.
I just love watching the modern units dish out destruction. It's fun.
It is. Be aware that there are other options, as you might find them to be fun too.