The events of September 10, 1848

Vienna Equivocates (Sept 10)

Little by little Vienna was creating an about-face on Hungarian independence. Part of the strategy was to turn the various nationalities against the Batthyány government: "divide et impera".
Foremost was the support of the Croatian Bán Jellaçiç, whose June 10 dismissal was not taken seriously. (For a review of Croatia/Hungary historical relationships click here)

[Sabor]
Jellaçiç addressing the Sabor (Croatia's governing body)

Equivocating, on Sept 4 the king encouraged Jellaçiç "... to promote the welfare ... of the monarchy ... and to aid the beneficial development of the Hungarian dependencies" ... The June "manifesto" was revoked. Though Jellaçiç assumed he would get support in his plan to invade Hungary, such did not seem to materialize.
On August 31 the king addressed a letter to the Palatine, accusing Batthyány of violating the "pragmatic sanction"* (which had tied Hungary to the balance of the Monarchy). He called on Hungary to surrender its independent finances and military, accused the Hungarian cabinet of plotting against Croatia. At Kossuth's initiative a massive delegation was sent to Vienna, but to no avail. (For the text of their message to Ferdinand V click here. )

Kossuth, remaining in Pest, initiated the issuance of 5-gulden banknotes, which had not been approved by the King who intimated that strong steps may have to follow. Caught in the crossfire, on September 10, Prime Minister Batthyány resigned. The Palatine had attempted to take over from the cabinet, but his troops joined the Hungarian Honvéd instead.

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*Based on Spanish law, the Pragmatic Sanction was designed to preserve a single line of royal succession based on primogeniture, thus discouraging parts of the empire from seceding by establishing sibling rulers. It recognized female succession to help preserve "the line".