Shield World (level)

Shield World is the tenth level of Halo Wars. The level is set on the same planet as the previous mission, against the Flood. The main mission is to rescue three different teams by killing all the flood in the way between the firebase and the units. Team Alpha reward you with a Grizzly tank, Team Bravo reward you with an Elephant, but when you try to rescue team Charlie the pelican is destroyed. The Spartans say they'll make their way to the base to be picked up there. The normal time limit is 18 minutes, but a side mission which gives you access to the special Gremlin unit that involves placing Gremlins in different corners of the map will buy you more time (About 22 minutes for all four of them.)

Plot of Cinematic
The Spirit of Fire follows Anders's signal out of Slipspace into an unknown planet. Suddenly the sea parts, Sentinels start flying overhead, and the ship is drawn into a docking and decontamination mechanism within the planet. Captain Cutter orders Serina to get all crew back aboard the ship, Serina protests but eventually follows orders and passes the order onto Sgt. Forge.

Trivia
This is the first level to feature Flood Thrasher Forms.

This is also a level in which the Gremlin can be accessed, which is odd because only Anders uses them, and she is not rescued until two levels later. Still they were on Captain Cutter's ship, and he may have just supplied her with them and assumed command over them in her absence.