On 17 June the Spanish sprang the mine under the Western bulwark. The assailants attacked the breach and were met again by heavy fire from the besieged with Governor Uytenhoove clad in armour leading his troops. The besieged then launched a counterattack and after an hour of desperate fighting the Spanish were repulsed with heavy loss; Uytenhoove however was severely wounded in the melee. With the repulse in the West Bulwark the Spanish had launched another attack on the "Polder". Here too was savage hand-to-hand combat with pikes and clubs pulled from the fascines but the besiegers finally overwhelmed the "Polder bulwark", whilst the besieged withdrew to their inner entrenchments. Losses to both sides were high with 1,200 men in total lost in the struggle. Uytenhoove would be replaced by Daniel d'Hertaing; the 5th replacement within the year and the last.