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5-10 cavalry units might not be enough.
New here? I'm Roha — want a quick tour?
Exile is needed to banish summoned Phoenixes.
The Knight doesn't have the Banish skill. Elemental Balance is, of course, very effective against the Phoenix, but I don't level up the Knight's magic skills.
What kind of perverts are you? :D You'll get more benefit from Light or Darkness. ;)
P.S. Add the word "Order" to the topic title.
On a global scale, it might be more, but if players, with standard upgrades, are having problems specifically with the Phoenix, then the standards need to be changed.