trians hope to screen Swabia from invasion on the side of Alsace.

[Illustration: BATTLE OF ULM.]

But Mack forgot two essential facts. Until the Russians arrived, he
was too weak to hold so advanced a position in what was hostile
ground, now that Bavaria and the other South German States obeyed
Napoleon's summons to range themselves on his side. Further, he was
dangerously exposed on the north, as a glance at the map will show.
Ulm and the line of the Iller formed a strong defence against the
south-west: but on the north that position is singularly open: it can
be turned from the valleys of the Main, the Neckar, and the Altmuehl,
all of which conduct an invader to the regions east of Ulm. Indeed, it
passes belief how even the Aulic Council could have ignored the
dangers of that position. Possibly the fact that Ulm had been stoutly
held by Kray in 1796 now induced them to overrate its present
importance; but at that time the fortified camp of Ulm was the central
knot of vast operations, whereas now it was but an advanced
outpost.[24] If Francis and his advisers were swayed by historical
reminiscences it is strange that they forgot the fate of Melas in
Piedmont. The real parallel had been provided, not by Kray, but by the
general who was cut off at Marengo. Indeed, in its broad outlines, the
campaign of Ulm resembles that of Marengo. Against foes who had thrust
their columns far from their base, Napoleon now, as in 1800,
determined to deal a crushing blow. On the part of the Austrians we
notice the same misplaced confidence, the same lack of timely news,
and the same inability to understand Napoleon's plan until his
dispositions are complete; while his strategy and tactics in 1805
recall to one's mind the masterly simplicity of design, the subtlety
and energy of execution, which led up to his triumph in the plains of
Piedmont.

Meanwhile the allies were dissipating their strength. A Russian corps,
acting from Corfu as a base, and an English expedition from Malta,
were jointly to attack St. Cyr in the south of Italy, raise the
country at his rear and compel him to surrender. This plan was left
helplessly flapping in the air by a convention which Napoleon imposed
on the Neapolitan ambassador. On September 21st Talleyrand induced
that envoy to guarantee the neutrality of the kingdom of Naples, all
belligerents being excluded from its domains. Consequently St. Cyr's
corps evacuated that land and brought a welcome reinforc