So there are a few Warlocks who have this kind of feat/combo going on:
Alphastrike with all beasts, then feat backwards.
The first time I ran against EKaya my Conquest died turn 2 with no retaliation. I was a sad puppy. I had a single-file line of Kayazy I thought would at least mitigate the amount of beasts he could force through. Nope. Pure blood sprays a hole through three of them, and they waltz in.
Ultimately I won that game because my opponent left open an assassination vector, but I would have definitely lost due to attrition.
Is there any way to stop this? Maybe I have to play close and run every turn until the alphastrike? Is there an infantry formation that can stop 4+ warbeasts that have the entire point of "Clear out a lane for the alpha strike" ? Or do I just need to prepare my list for loosing a heavy or two?