For the Trial of Capt. Richard Powell, Lieut. Christopher Seton, and Lieut. John Hall, of the 54th Regiment of Foot : on Several Charges Preferred Against Them Respectively by William Cobbett, Late Serjeant-Major of the Said Regiment : Together with Several Curious Letters which Passed Between the Said William Cobbett and Sir Charles Gould, Judge-Advocate General, and Various Other Documents Connected Therewith, in the Order of Their Dates