[1] Their plan was to arrest and assassinate several prominent Republican figures including the Defence Minister Sultan Hamengkubuwono IX and Secretary-General Ali Budiardjo.

The coup d'état led to the downfall of Sultan Hamid II and accelerated the integration of the RUSI into the Republic by 17 August 1950.

Ultimately, this federal government was short-lived due to conflicting differences between the Republicans and the Federalists as well as growing popular support for a unitary state.

[4] The APRA comprised various Republican elements including defectors from the Indonesian army, Islamic and communist battle groups.

The Legion was further augmented by elements of the KNIL, Royal Netherlands Army, Westerling's old commando unit and several sympathetic Dutch nationals including two police inspectors.

With no reply to his ultimatum, Westerling started the coup in the night of 22–23 January, a month after international recognition of the Republic of Indonesia.

Lovink was still serving as High Representative of the Crown of the Kingdom of the Netherlands, he had advised Hatta to charge Westerling with Article exorbitante rechten.

In his autobiography, Mémoires, published in 1952, Westerling wrote that a Shadow Cabinet had been formed under the leadership of Sultan Hamid II of Pontianak, so he had to keep it a secret.

On 21 January, Hirschfeld informed Götzen that General Buurman van Vreeden and Dutch Defence Minister, Jan Schokking, had been working on a plan for the evacuation of RST troops.

[8] With no reply to his ultimatum, Westerling started the coup in the night of 22–23 January, a month after international recognition of the Republic of Indonesia.

[7] On 22 January at 21.00 Westerling received a report that a number of heavily armed RST troops had deserted and left the military station in Batujajar.

Nix reported that the "Erik" company at Kampemenstraat that night was also going to desert and join the APRA in a coup, but was foiled by its own commander, Captain G.H.O.

On 22 January, Westerling's troops would infiltrate Bandung on board trucks, disguised as members of the Tentara Nasional Indonesia (TNI).

KNIL Lieutenant Colonel T. Cassa had telephoned General Engles and reported: "A strong APRA force is moving along Jalan Pos Besar towards Bandung.

[12] However, the second phase of the coup d'état collapsed since the majority of the KNIL's commanders cooperated with the Indonesian government and refused to support Westerling's actions.

There had been plans to seize the presidential palace, army barracks and to arrest Republican politicians including Sukarno, Hatta, Hamengkubuwono IX and Ali Budiardjo.

With the coup attempt in tatters, the APRA retreated from Bandung after negotiations with KNIL Major General Edu Engles.

On April 19, Hamid II confessed to his involvement in the botched Jakarta coup and to planning a second attack on Parliament scheduled for February 15.

[4] Hamid's role in the coup led to increased agitation in West Kalimantan for its integration as part of the Republic of Indonesia.

[3] Following clashes with demobilized KNIL troops under Andi Aziz in Makassar and the attempted secession of an Ambonese Republic of South Moluccas, the federal United States of Indonesia was dissolved on 17 August 1950, turning Indonesia into a unitary state dominated by the central government in Jakarta.