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In page Battle of Green Spring:

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Lafayette saw an opportunity to attack the British force as it made the difficult crossing of the James. Cornwallis also recognized the possibility, and decided to lay a trap, hoping to capture a portion of Lafayette's army.[9] He only sent his baggage train and John Graves Simcoe's Queen's Rangers across the river, and concealed his main force near the crossing. Cornwallis also sent men to "desert" to the Americans with information that most of the British force had crossed, leaving only a rear guard on the north side of the river.[10]