Cheat Mode:
Open "inventory? window by clicking on your warehouse. Then click once on one of the following things. A red triangle will apear in the field, as they get chosen.
Row 1, thing 3 (wooden boards).
Row 2, thing 2 (iron bars).
Row 2, thing 4 (wine casks).
Row 3, thing 1 (bread).
Row 3, thing 5 (cooked meat).
Row 4, thing 1 (animal hide).
Row 4, thing 5 (plate mail).
Row 5, thing 1 (axes).
Row 5, thing 2 (swords).
Row 5, thing 3 (lances).
Row 5, thing 4 (pikes).
Row 5, thing 5 (long bows).
Then click on row 6, thing 1 (crossbow) to get 10 of each thing added to your inventory.
Or
Row 6, thing 2 (horses) to complete that level.