Turn 1Terminators laugh at the silly attempt to prevent them from killing everything in their way, and promptly teleported right in front of the Russes, really hoping that father Nurgle would grant them initiative in the first turn. ÂÂ
Init DG
And their prayers were answered.
The assaulted the Leman Russ Battle Tank Company, the infantry company opens up with all their guns, and kills one terminator on his way toll smash some tanks. In the resulting melee frenzy, 6 Russes bites the dust from hits and combat result, and not a single terminator need to go sit on the sidelines. The broken tanks retreat out of sight from mostly everything. The terminators consolidates into some broken ground right in front of the Warhound, preparing for some hurt to come their way.
Seeing an opening the predator formation doubles forward to try to take some artillery down, sadly the only hit was saved and the manticores continues to prime their missiles.

The mechanized company do not like people shooting on their artillery support, and promptly advances to take care of business, a bucket of dice later, 4 hits are scored on the poor predators, but it was not their time to meet Nurgle, and only one of them is destroyed.

Next the Warhound retains and activates all weapons and unleash a hellish storm of firepower over the terminators, and 2 of the units melts in their armour as the plasma shots find their mark. The remaining formation breaks, but as stupidly fearless that they are, decides that staying put is a good tactic at the moment.

Retinue 1 marches and place themselves right behind the terminators for a daring assault next turn on the Warhound.
Next the Rough Riders decides to make short work of the remaining terminators, forgetting that they still have a commander left, in the engagement the terminator lord decides that is would be a good idea to bring in some reinforcement, and intermingles Retinue 1 that stands only a few centimetres away.
This did not help the Rough Riders one bit, and for the exchange of one unit of Plague Marines, every single Rough Rider is killed in action.
The Land Raider formation activates and marches right down the side of the table, to get in place for a more devastating attack next turn.
As the last formation left in the imperial side, the manticores tries to blow some Nurgle marines away, but this was not to be, and with a failed activation test they retreat away from the green tide.
Retinue 2 now marches and place themselves in position to strike at the warhound or the mechanized company next turn.
In the end phase all formation rallies, except the Russes that continues their retreat.