@rithechardless
Maybe...humans have an average of 5 liters of blood and assuming an average productivity of 50%, that would be a total of 1000 liters (2.5 X 400).
Blood has a default density of 1.06 g/mL and steel has default of a density of 8g/cm3. 1ml = 1 cm3.

The mass of the blood is 1.06 tons (1.06 X 1000L). So the mass with the new compressed density would be 132 kg (1060 / 8).

Blood of 400 men is way too much, even with 50% efficiency.
The average steel longsword weights 2-3 kg only.