Clinton's expeditionary force returned from Sullivan's Island Aug. 1st, and the active campaign began when, three weeks later, Howe moved a large part of his force across from Staten Island[755] to Gravesend, on Long Island, Aug. 22d, Sir George Collier commanding the fleet which covered the landing,[756] and the advance then began towards the lines near Brooklyn which General Greene had had the charge of constructing.[757] Respecting the orders antecedent to and during the battle, those of Washington are in Force; but Johnston adds to them from the orderly-books.[758] Washington's own account can be found in his letters to Congress, to Gov. Trumbull, to the Mass. Assembly,[759] and he probably dictated the letter of Col. Harrison, his secretary, to Congress.[760] [Illustration: BATTLE OF LONG ISLAND, 1776. Sketched from a part of a MS. Hessian map in the library of Congress, called _Plan générale des opérations de l'armée Britannique contre les Rebelles_, etc. KEY: "A, Le camp du Général Howe sur Staten Island à l'arrivée du général de Heister avec la 1re division des troupes Hessoises le 22 d'Aoust, 1776. B, Le camp qu'on occupa sur Staten Island cette division après du debarqué. C, L'endroit où les troupes debarquerent sur Long Island. D, Camp du général Howe près de Gravesend. E, Camp du général de Heister après la descente sur Long Island le 27 d'Aoust, 1776. F, Marche de la colonne droite commandée par le général Clinton vers Bedford dans la nuit du 26 au 27 Aoust. G, Marche de la colonne gauche, commandée par le général Grant. H, Attaque de l'avant garde du général Clinton du 27me Aoust. J, Où le général Clinton forma sa colonne pour continuer l'attaque. K, Attaque du général Grant. L, Attaque du général de Heister. M, Les lignes des enemis à Brooklin. N, Corps détachés de l'enemis hors de ses lignes. O, Les redoutes de l'enemis à Readhook. Q, Les redoutes à Gouverneur island." The lines (·—·—) represent roads. The blocks, half-black and half-white, are the Americans; those divided diagonally are the Hessians; the solid black are the British. A Hessian officer's map, obtained from Brunswick, and showing Ratzer's topography, is given in fac-simile in Field's monograph (p. 310), and a German map of Long Island is given in the _Geographische Belustigungen_ (Leipzig, 1776). There is a somewhat coarse-colored map among the Rochambeau maps (no. 25), measuring fifteen inches wide by eighteen high, called _Attaque de l'armée des Provinciaux dans Long Island du 27 Août, 1776_. _Publié, 1776._ A MS. "Plan of the Attack of the Rebels on Long Island by an officer of the army" is among the Faden maps (no. 56) in the library of Congress. The map used in Stedman is re-engraved, with additions, in Irving's _Washington_, illus. ed., ii. 309.] [Illustration: LONG ISLAND, AUGUST, 27, 1776.