Bloodied66
Chieftain
However, the retreat ability of the knight adds great survivability, and one unit is cheaper than two. Third, the knight can get to the battlefield much quicker. The high movement rate also allows for a knight to sit on a mountain (6 defense), wait for an enemy unit to go by, ride out to take it out, and then back onto the mountain. Longbows are stuck in the open, so you need to send your pikemen out there as well, where it only has 3 defense.
That said, you can't just send knights alone. Use pikemen to defend knights when possible, and to defend captured cities.
That said, you can't just send knights alone. Use pikemen to defend knights when possible, and to defend captured cities.