Flank attack has been changed in 3.17. From the changelog:
"Flanking damage now depends on strength of defending unit, not on strength of siege weapon".
"Flank attack now has a maximum number of siege units it can affect".
But, now it seems there`s no flank attack at all. I have attached two screens and a savegame. In the first one, the spanish catapults intact. In the second one, the cartaginian numidian archers damaged after their successful attacks, which led to no flank attack damage though...
"Flanking damage now depends on strength of defending unit, not on strength of siege weapon".
"Flank attack now has a maximum number of siege units it can affect".
But, now it seems there`s no flank attack at all. I have attached two screens and a savegame. In the first one, the spanish catapults intact. In the second one, the cartaginian numidian archers damaged after their successful attacks, which led to no flank attack damage though...