Final answer:
George Washington's spy network was instrumental in helping him b) anticipate the position of British redoubts at Yorktown, which led to the successful entrapment and surrender of Cornwallis's forces in the climax of the war.
Step-by-step explanation:
George Washington's spy network helped him b) anticipate the position of British redoubts at Yorktown. This intelligence was crucial in the events leading up to the Siege of Yorktown, marking the last major land battle of the American Revolutionary War.
Washington, informed by his spy network, was aware of Cornwallis's mistaken assumptions about American and French troop movements. This allowed Washington to move his army swiftly to Yorktown, utilizing the element of surprise and coordination with French forces both on land and at sea, effectively trapping Cornwallis and leading to his eventual surrender.
Moreover, the spy network played a critical role in understanding British strategies and tactics throughout the war and was pivotal in the eventual American victory.
This contributed to the success of the American forces by continually allowing them to be a step ahead of British movements, as was exemplified by the successful entrapment at Yorktown due to advanced knowledge of British positions.