We beat it on my fire team just now,
One thing we found helpful was having Titan Skate / Twilight Garrison in middle since theres so much ground to cover.
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With the strategy posted here, the middle has it pretty easy. With that being said I managed to cover front and back middle as a warlock....it was close but I made it.
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If you have good cannon holders you have more than enough time for placement prior to the last bomb thrown with any class.