A country of great extent, or at all events, a long line of retreat, is the first and fundamental condition; for an advance of a few marches will naturally not weaken the enemy seriously. Buonaparte’s centre, in the year 1812, at Witepsk, was 250,000 strong, at Smolensk, 182,000, at Borodino it had only diminished to 130,000, that is to say, had fallen to about an equality with the Russian centre. Borodino is ninety miles from the frontier; but it was not until they came near Moscow that the Russians reached that decided superiority in numbers, which of itself reversed the situation of the combatants so assuredly, that the French victory at Malo Jaroslewetz could not essentially alter it again.
No other European state has the dimensions of Russia, and in very few can a line of retreat 100 miles long be imagined. But neither will a power such as that of the French in 1812, easily appear under different circumstances, still less such a superiority in numbers as existed at the commencement of the campaign, when the French army had more than double the numbers of its adversary, besides its undoubted moral superiority. Therefore, what was here only effected at the end of 100 miles, may perhaps, in other cases, be attained at the end of 50 or 30 miles.
The circumstances which favour this mode of defence are—
- A country only little cultivated.
- A loyal and warlike people.
- An inclement season.
All these things increase the difficulty of maintaining an army, render great convoys necessary, many detachments, harassing duties, cause the spread of sickness, and make operations against the flanks easier for the defender.