The shadows seem longer in this part of the wood, and more than once you see deeper shadows than the rest move at the edge of sight. The oxen pulling the carts are skittish and the men are not much more composed. A shout from the very back of the army has you running back down the line.
As you approach, you hear the ring of steel against hard surfaces, a telltale sign of combat. By the time you reach the area, you see a few injured soldiers around the last supply wagon. You get them to explain what they saw, but they are having a hard time describing what happened. A pack of horned creatures, half-man and half-beast carrying twisted iron weapons had ambushed the column. Your mind immediately goes to the Scar Tribes you have fought, but the soldiers insist what hit them were no men, something else then. There was cunning in their attack, they had targeted the last wagon, killing a few soldiers and stealing some supplies before disappearing back into the shadows.
LOSE 1 SUPPLY (MIGHT CUBE)
IF YOU HAVE THE 'THIN FORMATION' KEYWORD ON YOUR FREE COMPANY SHEET, LOSE 1 SQUAD (REPRESENTED ON THE HIT POINT DICE)
Looking at the scene, you discover hoof prints and other strange markings. For all their speed, whatever these things are, they are not subtle. You could follow the tracks and try to recover your supplies, or with nightfall drawing near, you could give up the supplies as a lost cause and carry on.