The siege went on but slowly. Vigorous sorties were made, and the cavalry sometimes sallied out from the gates and made excursions as far as Wouw, a village three miles away, and took many prisoners. Among these were two commissaries of ordnance, who were intrusted to the safe keeping of the Deputy-Provost Redhead. They were not strictly kept, and were allowed to converse with the provost's friends. One of these, William Grimeston, suspected that one of the commissaries, who pretended to be an Italian, was really an English deserter who had gone over with the traitor Stanley; and in order to see if his suspicions were correct, pretended that he was dissatisfied with his position and would far rather be fighting on the other side. The man at once fell into the trap, acknowledged that he was an Englishman, and said that if Grimeston and Redhead would but follow his advice they would soon become rich men, for that if they could arrange to give up one of the forts to Parma they would be magnificently rewarded. Redhead and Grimeston pretended to agree, but at once informed Lord Willoughby, who was in command, of the offer that had been made to them. They were ordered to continue their negotiations with the traitor. The latter furnished them with letters to Stanley and Parma, and with these they made their way out of the town at night to the Spanish camp. They had an interview with the duke, and promised to deliver the north water fort over to him, for which service Redhead was to receive 1200 crowns and Grimeston 700 crowns, and a commission in Stanley's regiment of traitors. Stanley himself entertained them in his tent, and Parma presented them with two gold chains. They then returned to Bergen and related all that had taken place to Lord Willoughby. The matter was kept a profound secret in the town, Francis Vere, who was in command of the north fort, and a few others only being made acquainted with what was going on. On the appointed night, 22d of October, Grimeston went out alone, Redhead's supposed share of the business being to open the gates of the fort. When Grimeston arrived at Parma's camp he found that the Spaniards had become suspicious. He was bound and placed in charge of a Spanish captain, who was ordered to stab him at once if there was any sign of treachery. It was a dark night; the tide was out, for the land over which the Spaniards had to advance was flooded at other times. The attacking column consisted of three thousand men, including Stanley's regiment; and a number of knights and nobles accompanied it as volunteers.