When clearly provoked, it is your honor as cavalry to face infantry directly and not run from the challenge.
When enemy cavalry is positioned to overlook the field, respect their peace and do not approach them aggressively.
As a runner, it's your duty to pursue routed infantry and archers to prevent them from fleeing.
In a joint charge, junior cavalry go first to trample enemies and leave them vulnerable to attack by the senior.
If you unintentionally kill a friendly cavalry unit's horse, it's polite to dismount and offer your own horse to them.