What did the British offer to slaves to encourage them to join the British side during the American Revolution?

The proclamation declared martial law and promised freedom for slaves of American revolutionaries who left their owners and joined the royal forces, becoming Black Loyalists. According to historians, the proclamation was designed for practical and militaristic reasons rather than moral reasons or humanitarianism.

the award is named for an american naval historian and theorist, rear admiral alfred thayer mahan, united states navy who, through his writing, provided stimulus and guidance to those who share in the defense of the nation.