On the 8th of July at dusk the expedition set out from Sassenheim, taking with them four hundred wagon loads of provisions and seven cannon. They halted in the woods, and remained till midnight. Then they again marched forward, hoping to be able to surprise the Spaniards and make their way through before these could assemble in force. The agreement had been made that signal fires should be lighted, and that the citizens should sally out to assist the relieving force as it approached. Unfortunately two pigeons with letters giving the details of the intended expedition had been shot while passing over the Spanish camp, and the besiegers were perfectly aware of what was going to be done. Opposite the point at which the besieged were to sally out the Spaniards collected a great mass of green branches, pitch, and straw. Five thousand troops were stationed behind it, while an overwhelming force was stationed to attack the relieving army. When night fell the pile of combustibles was lighted, and gave out so dense a smoke that the signal fires lighted by Batenburg were hidden from the townspeople. As soon as the column advanced from the wood they were attacked by an overwhelming force of the enemy. Batenburg was killed and his troops utterly routed, with the loss, according to the Dutch accounts, of from five to six hundred, but of many more according to Spanish statements. The besieged, ranged under arms, heard the sound of the distant conflict, but as they had seen no signal fires believed that it was only a device of the Spaniards to tempt them into making a sally, and it was not until morning, when Don Frederick sent in a prisoner with his nose and ears cut off to announce the news, that they knew that the last effort to save them had failed. The blow was a terrible one, and there was great commotion in the town. After consultation the garrison and the able bodied citizens resolved to issue out in a solid column, and to cut their way through the enemy or perish. It was thought that if the women, the helpless, and infirm alone remained in the city they would be treated with greater mercy after all the fighting men had been slain. But as soon as this resolution became known the women and children issued from the houses with loud cries and tears. The burghers were unable to withstand their entreaties that all should die together, and it was then resolved that the fighting men should be formed into a hollow square, in which the women, children, sick, and aged should be gathered, and so to sally out, and either win a way through the camp or die together.