40 minutes before Sherburne, believing he was being attacked by a much larger force, surrendered. The Iroquois claimed these captives as war spoils, since they were not part of the fort's garrison, and prepared to kill some of them in retaliation for their own losses. Only the intervention of Forster, who paid a ransom, prevented this; it did not prevent the Iroquois from stripping the prisoners of all but their clothes. Arnold's relief Following his successes, Forster moved his forces, including all of the prisoners, down to Quinze-Chênes, where more Loyalist militia had assembled. Leaving some of the prisoners there, he advanced on May 23 to Fort Senneville, a fortified works on the southwest tip of Montreal Island that was owned by Montigny. In the meantime, Arnold gathered most of the few remaining forces in Montreal, and sent requests to the outposts around the city for additional troops. By May 24, he was entrenched at Lachine, south of the city, and his force had reached 450 men. Forster began to advance on Lachine, but decided to retreat back to Quinze-Chênes when his scouts notified him of Arnold's position. He also received intelligence from Montreal that Arnold's force was going to be massively reinforced—the reported number of reinforcements was 1,500 to 2,000 men, more than Arnold had available in the area. Once his scouts reported Forster's retreat, Arnold gave chase. He reached Fort Senneville (which he burned) on May 26, just as Forster's men were landing on the far shore at Quinze-Chênes. Arnold decided to send a group of Caughnawagas, who were friendly to the Americans, with a demand that Forster release his prisoners and a threat that he would destroy area Indian villages if any of the prisoners were harmed. Forster countered that he would permit his Indians to kill the prisoners if Arnold attacked. Arnold attempted to cross the Ottawa River with some of his men in bateaux, but Forster used the four-pounders captured at the Cedars to drive them back. Arnold called a war council so the Americans could consider their options. He wanted to mount a surprise attack the next morning; Hazen, who had acquired significant experience fighting Indians in the French and Indian War, argued against the idea. The disagreement between the two men was severe enough that it nearly provoked Arnold to file charges of insubordination against Hazen. The council decided not to act, voting