From the forest of Dourdan on the north to the Loire on the south, and from the Chartres region on the west to the Gatinais on the east, this great grain-growing plateau (the scene of Zola's famous novel "La Terre") is almost level. Although its soil is very fertile there are few watercourses in Beauce, none of them, moreover, being of a nature to impede the march of an army. The roads are lined with stunted elms, and here and there a small copse, a straggling farm, a little village, may be seen, together with many a row of stacks, the whole forming in late autumn and in winter--when hurricanes, rain, and snow-storms sweep across the great expanse--as dreary a picture as the most melancholy-minded individual could desire. Whilst there is no natural obstacle to impede the advance of an invader, there is also no cover for purposes of defence. All the way from Chartres to Orleans the high-road is not once intersected by a river. Nearly all of the few streams which exist thereabouts run from south to north, and they supply no means of defence against an army coming from the direction of Paris. The region is one better suited for the employment of cavalry and artillery than for that of foot-soldiers. The Chartres country is better watered than Beaude. Westward, in both of the districts of Perche, going either towards Mortagne or towards Nogent-le-Rotrou, the country is more hilly and more wooded; and hedges, ditches, and dingle paths abound there. In such districts infantry can well be employed for defensive purposes. Beyond the Loir--not the Loire-- S.S.W. of Chartres, is the Pays Dunois, that is the district of Chateaudun, a little town protected on the north and the west by the Loir and the Conie, and by the hills between which those rivers flow, but open to any attack on the east, from which direction, indeed, the Germans naturally approached it. Beyond the Loire, to the south-east of Beauce and Orleans, lies the sheep-breeding region called Sologne, which the Germans would have had to cross had they prosecuted their intended march on Bourges. Here cavalry and artillery are of little use, the country abounding in streams, ponds, and marshes. Quite apart, however, from natural obstacles, no advance on Bourges could well be prosecuted so long as the French held Orleans; and even when that city had fallen into the hands of the Germans, the presence of large French forces on the west compelled the invaders to carry hostilities in that direction and abandon their projected march southward. Thus the campaign in which I became interested was carried on principally in the departments of Eure-et-Loir, Loiret, Loir-et-Cher, and Sarthe, to terminate, at last, in Mayenne.