6.3.12
https://tbc.wowhead.com/quest=10373/a-call-to-arms-the-plaguelands
is started by
https://tbc.wowhead.com/npc=20722/herald-brandaan
turned in to
https://tbc.wowhead.com/npc=10838/commander-ashlam-valorfist

and is mutually exclusive with
https://tbc.wowhead.com/quest=5066/a-call-to-arms-the-plaguelands
https://tbc.wowhead.com/quest=5090/a-call-to-arms-the-plaguelands
https://tbc.wowhead.com/quest=5091/a-call-to-arms-the-plaguelands

When one of the four is in the log or completed, the others are not offered.