Not sure. We had a full unit of 109s at first. We met them high, we at 25k them slightly higher. We mixed it up with them, shot down quite a few. I know the second group of 109s was another unit because they came in high, in a solid group. They got the radio call and headed toward us. We shot down some of them, some others stayed around. About this time 2 190As showed up with them I think. Kinda foggy on the timing of the arrival of the first 2 190s. Then right at the end (where we all got slaughtered) a solid group of 190s came in with alt and speed.
First 109 group almost done away with = 1 squad, second 109 group = 2 squads, add the 190s and you got 3 squads. That's why I say "3 units"
It was one of the best, most intesnse, fights ever! I wouldn't have traded it for a thing! (except maybe a SpitIX!! heh heh)