• General Cavaignac reports that a 200-man detachment sent to reinforce the garrison of Aïn-Timmoushen was surrounded by Abd-el-Kader's cavalry and forced to lay down its arms, confirming the capture France had feared.
• Colonel Géry's column of 300 infantry and 250 cavalry, cut off near Tilouanet, fought off successive Kabyle attacks over two days, leaving 90 enemy dead on the ground before rejoining Colonel O'Keeffe's relief force.
• The Grand Duke of Tuscany refused to extradite fugitive Roman rebels, ordering them embarked at Leghorn for Marseille; a delighted Florentine crowd at the Teatro della Pergola showered his box with flowers.

• Mount Hekla, dormant for 79 years, erupted on the night of 2–3 September 1845, blasting lava four miles, opening two new craters, and killing livestock across Iceland while ash fell as far as the Faroe Islands.

• Bank messenger François Gardeur stole 88,394 francs from his employer M. Gillet, buried 78,000 francs in glass jars in the Bois de Vincennes, and disguised himself in women's clothing before his arrest; both he and his accomplice Joséphine Ravard were sentenced to five years' imprisonment.

Music

• Jenny Lind drew 3,810 people to a concert in the covered riding-school of the royal palace of Christiansborg in Copenhagen — an attendance 'without precedent' in the Danish capital.

Arts

• The Prussian government purchased from Beethoven's amanuensis Anton Schindler 47 unpublished songs, 136 Conversation Books recording the deaf composer's written dialogues, and the first draft score of Fidelio.

• Reviewer Louis Foucault praises Bescherelle aîné's Dictionnaire National for giving 60–65 words for every 22 in rival dictionaries, calling it a match for Johnson's and the Accademia della Crusca's lexicons.