This battle was the grand finale of a planned 3-part mini-campaign between my Tyranids of Hive Fleet Maturin, and some Orks who have taken over an entire continent on an Imperial world. You can read the battle reports for the first two games by clicking on the following links: Part 1 Part 2
This final battle in the campaign would represent the assault against the coastal defenses of Fortress Antorktica. We played it as a Planetstrike game, using the mission where there is one objective in the center of the table, and the attacker had to control it at the end of the game. This seemed like a good way to represent an attempt to punch a hole through the Ork coastal defenses.