Ambushed in the Underhive

You serve in the 597th Valhallan Ice Warriors. Your regiment has been stationed in a hive city and is awaiting further orders regarding an upcoming operation, meanwhile you and your squad were sent to patrol the under hive. You were unaware of the threat until they were upon you, genestealers and cultists attack you and the vox fails. You are cut off, surrounded and need to warn the rest of the regiment before it is too late. — — — — — Totally didn’t make this scenario because I am reading the books.