The occupying army prepares to leave

J.L. Bell reports on British preparations on March 15, 1776 to evacuate Boston:

... The General told us the Troops would embark this day and was told by General [James] Robertson it would be by three oclock. The Regiments all mustered, some of them marched down the wharf. Guards and Chevaux De Freze, were placed in the main streets and wharves in order to secure the retreat of Out Centinels. Several of the principle streets through which they were to pass were filled with Hhds. [hogsheads] filled with Horse-dung, large limbs of trees from the Mall [a tree-lined walk on Boston Common] to prevent a pursuit of the Continental Army. They manifestly appeared to be fearful of an attack. ...