The commissar dashes into the farm house and uncermoniously executes the
officer. Seeing his commanders brains spread evenly across the wall the remaining trooper throws down his auto rifle and raises his hands to the ceiling.

Its only now that you can get a good look at him. He's young- very young- no more than 19, and looks terrified.. Like the rest he's wearing a dark grey green overcoat- probably some old PDF cast offs, and a dark metal helmet. His head underneath has been completely shaven. Any imperial symbols have been very neatly snipped off, so as not to damage the fabric. His weapon looks like some cheap stamped metal gun churned out by the thousand by some anonymous manfactorum converted to meet the coming invasion. He lacks most basic military equipment, including body armour. On the table in front of him is this map
Spoiler
Show
.

Outside Cpl Gantz shots go wide and bury themselves harmlessly in the mud. Looking into the shed you can see a box filled with large shells, behind this is civilian fruit picking equipment showing signs of age and rust. To military minds it is as alien in purpose as anything devised by the Eldar race.
A quick glance at the larger barn shows it has been filled with even more of these large heavy shells.

Spoiler
Show
An easy +20 knowledge check for anyone seeking to identify the shell types.