Barbary Corsair
These are pirate mercenary infantry who attack with a sword at close range, they are very fast, even before being upgraded all the way they are only a little bit slower than most cavalry, they do not have a high damage, but they are great against villagers and other hand infantry.

Black Rider
These are just the same as Dragoons expect for a little bit more armor and damage, if you like Dragoons you will love Black Riders. If your civilization does not have Dragoons, then you should invest some money into Black Riders.

Hackapell
This cavalry unit has the highest hand damage of any cavalry unit in the entire game, they are heavily armored and very fast, hit points are a little lower than most cavalry but they are still worth it.

Highlander
These are the most powerful Musketeers in the game; they have almost twice as much ranged damage as the British Musketeer. They have high life and a good range.

Jaeger
These units are a lot like super Skirmishers. They do less damage than Musketeers but fire faster and have a longer range, like Skirmishers they excel at killing infantry. For best results pair Highlanders and Jaegers together, with the Highlanders in the front and the longer ranged Jaegers in the back.

Landsknecht
These slow moving infantry are essentially super Halberdiers. They are good against buildings and especially cavalry.

Mameluke
One of the ultimate cavalry, not as powerful as the Hackapell, but it has almost fifteen hundred hit points, that is about three times the amount of a fully upgraded heavy horseman. Combine these with Hackapells for best battle results.

Manchu
A Cavalry Archer from China, very fast and good as destroying other cavalry, best used for hit and run attacks.

Ronin
These are Samurai; they are excellent against other hand infantry, and very effective against buildings.

Stradiot
Although this is a light cavalry unit, there is nothing light about it, fully upgraded over eight hundred hit points and very high damage, it would be most unwise to not use these.

Swiss Pikeman
Much like the Landsknecht, this unit excels at destroying buildings and cavalry, but keep it away from infantry, even with high damage and hit points, it does not do well against infantry.

Privateer
This is a mercenary warship, it is a good starting warship, it is not as powerful as the Frigate, but it has more hit points than the Caravel and is very fast.