At the beginning of the first round of each encounter, you gain focus equal to your glory + Wits, as long as you've had a minute or two to catch your breath since the last fight. It is possible to gain focus during combat, but you do not carry excess between battles.
At the end of each of your turns in an encounter, you gain focus equal to 1d3 + Wits, provided you didn't attempt a great deed, which costs focus.
If you roll a failure againt all targets of a focus-costing deed, you regain half of the spent focus immediately.