- Prolonged Siege: Without the French fleet, the American and French forces would have had a much harder time blockading the British forces in Yorktown. The British could have received supplies and reinforcements by sea, prolonging the siege and making it more difficult for the Americans to achieve victory.
- British Naval Support: The British navy was still powerful at the time, and without the French fleet to contend with, they could have provided significant naval support to the British forces at Yorktown. This could have turned the tide of the battle in the British favor.
- Lack of Continental Navy: The Continental Navy was relatively weak compared to the British navy. Without the French fleet's assistance, the Continental Navy might not have been able to effectively blockade the York River or prevent British naval reinforcements from reaching Yorktown.
- Delayed American Victory: The timely arrival of the French fleet allowed the Americans to effectively surround the British forces at Yorktown, leading to their surrender. Without the French fleet, the American victory at Yorktown might have been delayed or even prevented, giving the British more time to regroup and potentially change the course of the war.
- French Diplomatic Intervention: The presence of the French fleet also had diplomatic implications. It put pressure on Britain's allies, such as the Netherlands and Spain, to stay out of the conflict and provided additional leverage for American diplomats in negotiating a peace treaty. Without the French fleet, Britain might have been more willing to risk further escalation of the war.
Overall, the aid of the French fleet was crucial in securing a decisive American victory at Yorktown and hastening the end of the American Revolutionary War.