On 12 March the Spanish launched a determined effort to carry the "lesser Polder bulwark". The little fort was soon overwhelmed and the defenders were at last driven out of it and forced to take refuge in the next work; the first attrition success had been registered for Spinola. Gieselles was killed soon after observing the captured position, and was succeeded by Colonel John van Loon, who died just four days later by the impact of a cannonball, his provisional substitute Jacques de Bievry was wounded and evacuated to Zealand.