However , they left only after news of the Treaty of Alliance had reached London .
A commission was sent to negotiate a settlement with the Americans , organized by William Eden , with George Johnstone , and headed by Frederick Howard , 5th Earl of Carlisle .
Americans left only after news of the Treaty of Alliance had reached London .
A commission was sent to negotiate a settlement with the Americans , organized by William Eden , with George Johnstone , and headed by Frederick Howard , 5th Earl of Carlisle .