Although the main advance of the invaders was along the lines of the two railways, they ventured, as they realised how weak the forces were which opposed them, to break off both to the east and west, occupying Dordrecht on one side and Steynsberg on the other. Nothing of importance accrued from the possession of these points, and our attention may be concentrated upon the main line of action. French's original force was a mere handful of men, scraped together from anywhere. Naauwpoort was his base, and thence he made a reconnaissance by rail on November 23rd towards Arundel, the next hamlet along the line, taking with him a company of the Black Watch, forty mounted infantry, and a troop of the New South Wales Lancers. Nothing resulted from the expedition save that the two forces came into touch with each other, a touch which was sustained for months under many vicissitudes, until the invaders were driven back once more over Norval's Pont. Finding that Arundel was weakly held, French advanced up to it, and established his camp there towards the end of December, within six miles of the Boer lines at Rensburg, to the south of Colesberg. His mission--with his present forces--was to prevent the further advance of the enemy into the Colony, but he was not strong enough yet to make a serious attempt to drive them out. Before the move to Arundel on December 13th his detachment had increased in size, and consisted largely of mounted men, so that it attained a mobility very unusual for a British force. On December 13th there was an attempt upon the part of the Boers to advance south, which was easily held by the British Cavalry and Horse Artillery. The country over which French was operating is dotted with those singular kopjes which the Boer loves--kopjes which are often so grotesque in shape that one feels as if they must be due to some error of refraction when one looks at them. But, on the other hand, between these hills there lie wide stretches of the green or russet savanna, the noblest field that a horseman or a horse gunner could wish. The riflemen clung to the hills, French's troopers circled warily upon the plain, gradually contracting the Boer position by threatening to cut off this or that outlying kopje, and so the enemy was slowly herded into Colesberg. The small but mobile British force covered a very large area, and hardly a day passed that one or other part of it did not come in contact with the enemy. With one regiment of infantry (the Berkshires) to hold the centre, his hard-riding Tasmanians, New Zealanders, and Australians, with the Scots Greys, the Inniskillings, and the Carabineers, formed an elastic but impenetrable screen to cover the Colony. They were aided by two batteries, O and R, of Horse Artillery. Every day General French rode out and made a close personal examination of the enemy's position, while his scouts and outposts were instructed to maintain the closest possible touch.