Spread them out and make sure each one 50 meter farther from the other one. Just focus on these 3 units, use the barrage again as soon as the cooldown is over. If you get mattress-ed then recrew with volks and repair and keep doing what you've been doing. Killing those emplacements.
This works perfectly for 2vs2 and up. For 1v1 the DOC is rarely used. You can still go 3x leIG though.
![](https://www.coh2.org/file/10967/helmsman.jpg)