How do the lobsterback react when the Rebel messenger rides into town unknowingly?

When the Rebel messenger rides into town unknowingly, the lobsterbacks, or British soldiers, react with surprise and suspicion. They are alert and on high guard, as they are on the lookout for any signs of Rebel activity. If they recognize the messenger's intent, they may attempt to apprehend him to prevent any communication that could aid the Revolutionaries. Their reaction reflects the tense atmosphere and the escalating conflict between the British and the colonial rebels.