This might sound like a dumb question but on the arena defence tab where it says victory/defeat which one means the team attacking you lost the battle.

Still learning the arena but have hit a lot higher ranking since getting clairvoyant and magus werewolf, beating higher ranked teams

Currently sitting at duelist II on 1959

Soldier Ed lv100 sharded
Killer beast lv100 sharded
Werewolf lv 96 partially sharded
Clairvoyant lv59 partially sharded