I chose a very vehicle heavy death guard. 2 crawlers, 1 drone, 1 contemptor dread, 2 plague marine squads, 1 daemon prince. Ultramarines were very infantry heavy, eradicators, hellblasters, 2 squads of assault intercessors, bladeguard veterans, outriders and indomitus captain. Oh and a big ol redemptor dread.
Hard game but smurfs took a big hit with the redemptor being taken out in the first turn and then exploderising and taking out maybe 6 wounds from the units around him which had put them on the back foot from the beginning. There were a couple of moments when things could have swung around.
Beast moment of the game indomitus ultra captain charging one plagueburst crawler and managing to tie them both up in combat. But death guard resilience saw them through a round or two by the skin of their teeth. Used new strategy to power up the entropy cannons on the crawlers which was potent. (Although i did fail all of my disgusting resilient saves for the first two turns i think which was particularly frustrating)
Hard fought and unlucky for ultras id say, would have been a different game if the redemptor hadnt exploded.