ning to move
inland; Davoust and Soult left some regiments, 30,000 strong, to guard
the flotilla, and Marmont detached 14,000 men to defend the coasts of
Holland; but the other corps on September 2nd began their march
Rhine-wards in almost their full strength. On that day Bernadotte
broke up his cantonments in Hanover, and began his march towards the
Main, on which so much was to turn. The Elector of Hesse-Cassel now
espoused Napoleon's cause. Thus, without meeting any opposition,
Bernadotte's columns reached Wuerzburg at the close of September; there
the Elector of Bavaria welcomed the Marshal and gave him the support
of his 20,000 troops; and at that stronghold he was also joined by
Marmont.

In order to mislead the Austrians, Napoleon remained up to September
23rd at St. Cloud or Paris; and during his stay appeared a _Senatus
Consultum_ ordering that, after January 1st, 1806, France should give
up its revolutionary calendar and revert to the Gregorian. He then set
out for Strassburg, as though the chief blows were to be dealt through
the passes of the Black Forest at the front of Mack's line of defence;
and, to encourage that general in this belief, Murat received orders
to show his horsemen in the passes held by Mack's outposts, but to
avoid any serious engagements. This would give time for the other
corps to creep up to the enemy's rear. Mack, meanwhile, had heard of
the forthcoming junction of the French and Bavarians at Wuerzburg, but
opined that it threatened Bohemia.[26]

Accordingly, he still clung to his lines, contenting himself with
sending a cavalry regiment to observe Bernadotte's movements; but
neither he nor his nominal chief, the Archduke Ferdinand, divined the
truth. Indeed, so far did they rely on the aid of the Russians as to
order back some regiments sent from Italy by the more sagacious
Archduke Charles; but 11,000 troops from Tyrol reached the Swabian
army. That force was now spread out so as to hold the bridges of the
Danube between Ingolstadt and Ulm; and on October 7th the Austrians
were disposed as follows: 18,000 men under Kienmayer were guarding
Ingolstadt, Neuburg, Donauwoerth, Guenzburg, and lesser points, while
Mack had about 35,000 men at Ulm and along the line of the Iller; the
arrival of other detachments brought the Austrian total to upwards of
70,000 men. Against this long scattered line Napoleon led greatly
superior forces.[27] The development of his plans proceeded apace.
Thoug