sannin era tsunade was when she was dubbed sannin by hanzo, it was when she wore the anbu gear. its different from sannin war tsunade

sannin war was when jiraiya, tsunade and orochimaru were fighting against each other, it was post chunin exams so the sannin war orochimaru has the snake sword mystery instead of summoning the 1st and 2nd hokage because at that period hiruzen sealed orochimaru's hands. and if i remember correctly they also have a sannin era orochimaru as well