As the British army retired, General Greene advanced. Not being yet in a condition to hazard an engagement, he changed his ground every night. In the course of the critical movements, which were made in order to avoid an action, and at the same time to overawe the loyalists, and maintain a position favourable to a junction with the several detachments who were marching from different quarters to his assistance, he derived immense service from a bold and active light infantry, and from a cavalry which, though inferior in numbers, was rendered superior in effect to that of his enemy, by being much better mounted. They often attacked boldly and successfully, and made sudden incursions into the country, which so intimidated the royalists, that Lord Cornwallis found it difficult to obtain intelligence. By these means, all his attempts to bring the American general to action were frustrated; and his lordship was under the necessity of keeping his men close in their quarters. During this hazardous trial of skill, Lord Cornwallis moved out in full force towards Rudy fork, where the light infantry lay, in the hope of surprising that corps under cover of a thick fog; and probably with ulterior views against General Greene. His approach was perceived, and a sharp skirmish ensued between a part of the light infantry, and a much superior body of British troops commanded by Lieutenant Colonel Webster, in which the loss was supposed to be nearly equal. The advance of the British army obliged Williams to retire; and General Greene, by recrossing the Haw and uniting with the light infantry on its north-eastern bank at the Rocky ford, disappointed any farther designs which might have been formed against the army then under his command, or against the reinforcements which were approaching. Being thus foiled, Lord Cornwallis withdrew to Deep River, and General Greene fell back to the iron works on Troublesome creek. At length his reinforcements, though much inferior to the number he had been taught to expect, were received, and Greene, in his turn, sought a battle. With this view, he dissolved the corps of light infantry, advanced towards his enemy, and encamped within eight miles of him, at Guilford court house. His army, including officers, amounted to about four thousand five hundred men, of whom not quite two thousand were continental troops and the residue consisted of Virginia and North Carolina militia. Those of Virginia were commanded by Generals Stevens and Lawson, and by Colonels Preston, Campbell, and Lynch; and those of North Carolina, by Generals Butler and Eaton.