local countdown = 10
for i = 1 + 1, 10 do pUnit:RegisterEvent("CountDown", 1000, 0)
end

function Countdown(pUnit, event)
    countdown = countdown - 1
    for _,v in pairs(GetPlayersInZone(zoneid) do
        v:SendBroadcastMessage("The battle will start in countdown seconds!")
    end
end