18 February – Sir Andrew Clarke arrives from Singapore and begins negotiations between the two kings to resolve the dispute and misunderstanding between them.
24 February – Prince Wichaichan agrees to a settlement and signs the document. The prince would remain as Front Palace, with all former privileges, however his private army and navy must be disbanded.
14 April – King Chulalongkorn created the Ministry of the Treasury (later renamed the Ministry of Finance) by splitting the Ministry of Ports. The remainder of the Ministry of Ports was reorganised and renamed the Ministry of Foreign Affairs. Both reorganisations were part of the king's modernization of the government.
The Revenue Department was created to collected taxes.
The Telegram Department was created, its first office was located near the Ministry of Defence building in Bangkok. The first telegram was sent from Bangkok to nearby Samut Prakan. The service was originally reserved for official use only, at 12 satang per word. The service survived until 2008. Its first director was Prince Bhanurangsi Savangwongse, the king's brother.
The Haw wars; the Royal Siamese Army crossed the Mekong River at Nong Khai and commenced an advance against Chinese Black Flag forces based at Chiang Kham. The Chinese refused to give battle and instead retreated into the mountains. The Siamese army later crossed back into Siam without having destroyed the bandits.