Combat is conducted in rounds and Op pts must be expended to attack. If anything, combat reminds me of the way it is conducted for Columbia wood block games with a few neat twists. Naval and Siege combat are resolved somewhat similarly. Military skill of one leader can be added to the die result. All units must be fired on before any unit can be fired on for a second time.
Players lose or gain Diplomacy points as a result of combat.
Pursuing units can fire at retreating units. A retreating force can even be chased and battled again. There are a few minor annoying errors. Income Collection is left off the sequence of play chart. It seems to occur first before the Diplomacy period.