A Defender's Guide--Make Sure you can defend these Units

Only list common units
List by the time that unit may enters your territory. So you shall have the ability to defend at that time. (If you wish to develop peacefully)
T0~10:
Eagle Warrior 28
War-cart 30
T10~20:
Maryannu 25/35
Bireme 30
Longship 30
T20~30:
Hetaroi 36
Horseman 36 (Take care of Mongol/Scythia)
Varu 40
T30~40 (Be aware of the existence of GG)
Toa 36
Legion 40
Negao Mbeba 36
T40~50
Crossbow 30/40
Crouching Tiger 30/50
Wara-ku 20/40
Impi 41 (but it may form 56-strength corp, take care)
Black Army 47
Courser 44
T50~60
Khsevur 45
Hwacha 45/60
Samurai 48
Mumluk 48
Mandekalu 49
Caravel 50
Jong 45/55
T60~70
Janissary 60
Conquistador 55
Carolean 55
Bombard 43/55
Cavalry 62
Cossack 67
Privateer 40/50
De Zevin Provincia 50/60
Frigate 45/55
T70~80 (Be aware of Corps/Fleets)
Field Cannon 50/60
Red-coat 65
Garde Impale 65
Huskar 65
Cuirassor 64
T80~90 (Be aware of Army/Amanda)
Rough Rider 67
Digger 72
Artillery 70/80
Minas Geras 70/80
T90~100
Tank 80
Bomber 85/110
Fighter 100/100
P51-Mustang 105/105
Submarine 65/75
Machine Gun 65/75
T100~110
Modern Tank 90
Nuclear Submarine 80/85
Missile Cruiser 70/85
Destroyer 80
T110~120
Helicopter 82
Mechanized Infantry 85
Nuke
T120~130
Thermal Nuke
Stealth Bomber 90/120
Jet Fighter 110/110
GDR 130/120
T130+
level 4 GDR 140/150

 

Of course you won't encounter all of them at the same time. It will likely be one of them depending the era. So you have to prepare the best counters for the right units.

Caravels best counters are...caravels. If you miss the opportunity you can miss the whole ocean and be stuck inland. It means some early harbors and lighthouses and you need gold anyway. Get mercenaries asap. Can be valuable to get niter first for a frigates rush but make sure to have some crossbows ready just in case. They can counter caravels if your cities arent too exposed.

 

I guess ranged units get -17 against navals so they only deal little damage to caravels?

 

It's not really for killing them it's more to harrass enough to not let him take your city. Unless you can get 2 promos.