Final answer:
The concern among escaped slaves was that they would be returned to their masters with the restoration of peace, but Great Britain's Proclamation affirmed their freedom, providing certificates that dispelled their fears.
Step-by-step explanation:
The enslaved people who had escaped to the British Army were deeply concerned when they heard that peace was being restored between America and Great Britain. They were worried their newfound freedom would be taken away and they would be returned to their masters. However, Great Britain issued a Proclamation guaranteeing freedom to all slaves who had taken refuge with the British, which included receiving a certificate of freedom from the commanding officer in New York. This proclamation was crucial, as it affirmed the promise of freedom to those who had risked their lives and severed ties with their past in the pursuit of liberation.