A sufficiently deep injury near arterial canals would cause blood loss, and the heart would need to pump harder to compensate. However, without medical attention, the person can die of blood loss, especially if other injuries impair them as well.

A deep gash like the one Valjean sustained, whether or not arteries were cut, with sufficient time could have caused him to die, especially if the other wounds were inflicted while he was still alive.

[She is not ok Anna help]