Operations seemed at a stand, when, late in April, intelligence was received of Cornwallis' march from South Carolina toward Virginia and, in spite of every effort of Lafayette, he, at the end of May (1781), joined Phillips at Petersburg, taking the command of the whole army. Being then decidedly superior he took possession of Richmond and began a hot pursuit of Lafayette, who retreated into the upper country so rapidly and so skillfully that he could not be overtaken. The English general then turned back and sent a detachment under Colonel Simcoe, who destroyed the chief magazine at the junction of the two branches of James river. Tarleton pushed his cavalry so swiftly upon Charlotteville, where the State Assembly was met, that seven members were taken and the rest very narrowly escaped. Lafayette, however, now returned with a considerable force and by his maneuvers induced the British commander to retire to Williamsburg. He afterward continued his retreat to Portsmouth in the course of which the former made an attack but was repulsed and would have been totally routed had not his strength been estimated above its real amount. The movement of Cornwallis into Virginia had been wholly disapproved by Clinton who complained that, contrary to all his views and intentions, the main theater of war had been transferred to a territory into which he never proposed more than partial inroads, considering it very difficult to subdue and maintain. His grand object had always been first to secure New York and, if sufficient strength was afforded, to push offensive operations thence into the interior. Hoping, therefore, that the Carolinas, once subdued, might be retained by a small force, he had repeatedly solicited the partial return of the troops. Cornwallis defended the movement by observing that his situation at Wilmington, allowing no time to send for instructions, obliged him to act on his own responsibility. Communicating also with the government at home he urged that the Carolinas could not be securely held without the possession also of Virginia; that this might be attained by a vigorous effort, and would make Britain mistress of all the southern Colonies, whose resources could be then employed in conquering the more stubborn regions of the North. These arguments, recommended by his lordship's brilliant achievements at Camden and elsewhere, convinced the ministry, and Lord Germaine wrote to the Commander-in-Chief to direct his principal attention to the war in Virginia and to the plan of conquest from south to north. The latter, considering himself thus slighted, solicited permission to resign and leave the command to an officer who enjoyed greater confidence, but his merits being highly estimated this tender was not accepted.