It went poorly for the Guard.
100PL battle, Tyranids vs Imperial Guard with a Deathwatch Squad. Tyranids went first, and the Guard never found their footing. Not to mention the worst Overwatch rolling I have made in a long time. Even with the Strategy card that lets me hit on a 5+.
We were playing with Tactical Objectives, and at the end of turn three it was Tyranids:7 Guard:0.
Even though I lost bad, it was a fast, fun game. Next time I will manage my deployment better...
The Hive Mind Hungers
This Was a Good Snack Though