|A counterstrike occurs when the aggressor's offense has run its course. The defender executes a succesful defense and then swings back with their own attack. From that point they are on the offensive, until the whole situation reverses with another counterstrike.|
Generally you will get between three and five swings per offensive, unless you are fighting an opponent whose defensive skill is much higher than your offense. In that case you will get fewer swings - possibly as few as one or two.