On 18 April Spinola ordered another assault this time on the "Western ravelin". After a hand to hand action in which great numbers of officers and soldiers were lost on both sides the fort was eventually carried. This was an important success for the Spanish who had now worked their way with galleries and ditches along the whole length of the counterscarp till they were nearly up with the "Porcepsic". Soon after the Spanish assaulted the main "Porcepsic" itself but were repelled with further losses, but despite this Spinola then undertook a formal siege of the enceinte.