This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Fringe Engineer Tezzla wants you to kill 50 Bombardment Infantry, 20 Gargoyle Ambushers, 12 Frostbrood Sentries and 12 Scourge War Machines.
<name>, the struggle continues. Lucky for us, we're stocked up on bombs and rockets! Time for another bombing mission -- this one's a long one, through the Bombardment and into the Valley of Lost Hope. Head back out with an infra-green bomber and blow those Scourge into little scourge-lets!