Now in most terrains where feudal cavalry was concerned, the existence or non-existence of a road, and its character, would be of little moment in the immediate neighbourhood of the action: for though a feudal army depended (as all armies always must) upon roads for its _strategics_, it was almost independent of them in its _tactics_ upon those open fields which were characteristic of mediæval agriculture. The mounted and armoured men deployed and charged across the stubble. Those who have read the essay upon the Terrain of Crécy, which preceded this in the present series, will appreciate that the absence of a road uniting the English and French positions in that battle was of no significance to the result. But in the particular case of Poitiers this road, and a certain cart-track leading off it, must be carefully noted, because between them they determine all that happened; and the reason of this is that the front of the English position was covered with _vines_. The French method of cultivating the vine, and the condition of that cultivation in the middle of September (in all but a quite exceptionally early year so far north as Poitou), makes of a vineyard the most complete natural obstacle conceivable against the use of cavalry, and at the same time a most formidable entanglement to the advance of infantry, and a tolerable cover for missile weapons at short range. The vine is cultivated in France upon short stakes of varying height with varying districts, but usually in this neighbourhood somewhat over four feet above the ground; that is, covering most of a man's figure, even as he would stand to arms with a long-bow, yet affording space above for the discharge of the weapon. These stakes are set at such distances apart as allow ordered and careful movement between them, but close enough together to break and interfere with a pressed advance: their distances being determined by the fulness of the plant before the grapes are gathered, a harvest which falls in that region somewhat later than the date of the action. Wherever a belt of vineyard is found, cultivated after this fashion, the public ways through it are the only opportunities for advance; for land is so valuable under the grape that various allotments or properties are cultivated to their outermost limit. The vineyards (which have now disappeared, but which then stood upon the battlefield) could only be pierced by the roads I have mentioned.[7] This line, then, already well protected by the vineyards, was further strengthened by the presence of a hedge which bounded them and ran along their eastern edge upon the flat land above the depression.