In May he took the field, requesting Vere to cooperate with him in the siege of Zutphen. But Sir Francis determined in the first place to capture on his own account the Zutphen forts on the opposite side of the river, since these had been lost by the treachery of Roland Yorke. He dressed up a score of soldiers, some as peasants, others as countrywomen, and provided them with baskets of eggs and other provisions. At daybreak these went down by twos and threes to the Zutphen ferry, as if waiting to be taken across to the town; and while waiting for the boat to come across for them, they sat down near the gate of the fort. A few minutes later a party of English cavalry were seen riding rapidly towards the fort. The pretended country people sprang to their feet, and with cries of alarm ran towards it for shelter. The gates were thrown open to allow them to enter. As they ran in they drew out the arms concealed under their clothes and overpowered the guard. The cavalry dashed up and entered the gate before the garrison could assemble, and the fort was captured. Vere at once began to throw up his batteries for the attack upon the town across the river, and the prince invested the city on the other side. So diligently did the besiegers work that before a week had passed after the surprise of the fort the batteries were completed, thirty-two guns placed in position, and the garrison, seeing there was no hope of relief, surrendered. On the very day of taking possession of the town, the allies, leaving a garrison there, marched against Deventer, seven miles down the river, and within five days had invested the place, and opened their batteries upon the weakest part of the town. A breach was effected, and a storm was ordered. A dispute arose between the English, Scotch, and Dutch troops as to who should have the honour of leading the assault. Prince Maurice decided in favour of the English, in order that they might have an opportunity of wiping out the stigma on the national honour caused by the betrayal of Deventer by the traitor Sir William Stanley. To reach the breach it was necessary to cross a piece of water called the Haven. Sir Francis Vere led the English across the bridge of boats which had been thrown over the water; but the bridge was too short. Some of the troops sprang over and pushed boldly for the breach, others were pushed over and drowned. Many of those behind stripped off their armour and swam across the Haven, supported by some Dutch troops who had been told off to follow the assaulting party. But at the breach they were met by Van der Berg, the governor, with seven companies of soldiers, and these fought so courageously that the assailants were unable to win their way up the breach, and fell back at last with a loss of two hundred and twenty-five men killed and wounded.