Another villager is waiting for you at the Frontier. He's a man who deserted from the army and now is persecuted by the British soldiers.
To help him, quickly kill the group of soldiers and in the end kill the last enemy with a pistol shot. That way you will end the mission.
Speak with the blacksmith, head to New York and enter any shop marked with the symbol of a British pound.
You will find the required tools in the Homestead menu. They cost 50 pounds in total.
After buying the tools, return to Dave and end the mission.
An Eye for Trouble
Meet with the blacksmith and start chasing the soldiers.
You need to quickly catch up and kill him. If he manages to get onto a horse, jump onto the one beside and ride after him. You just need to get close enough and press the attack button for Connor to automatically assassinate him.
The mission will end after you return to Dave.
The British soldiers are preparing for another attempt of catching the deserter.
To defend from the attackers, take the barrel pointed by Dave and place it on the road between the tree and the rock.
A group of soldiers will soon appear there. By shooting the barrel with the pistol, you will quickly eliminate all the enemies. With the last enemy killed, quickly reload the gun and go for the second gunpowder barrel. Place it in the exact same place and wait for the second group of soldiers to appear. The mission will end after their death.