I was playing erebus and my friend was playing Oak. We decided not to exploit bat swarm/cloak to take the enemy portal since it was crucible, as we wanted just a good hard fought game.
The rooks ran over us for the first half of the game and pushed us all the way back to our base, where we were only able to defend and live by constant runs to the health crystal and occassionally locking our portal flag when all 5 were in our base.
Enough kills eventually leveled us up and let us get enough gold to get the items we needed to turn it around. Was great fun.