Pa Banger is an Iban longhouse five kilometres from the Sarawak-Kalimantan border in 4th Division of Sarawak. At midday on the 25 January about eleven men in jungle green uniform of the type used by Indonesian regulars and armed with rifles approached the longhouse. The soldiers informed the inhabitants of the longhouse that they were Indonesian Regular soldiers. The people in the longhouse were frightened and ran into the jungle nearby. About half-an-hour later there were two loud explosions. From the jungle edge the inhabitants of the longhouse saw it starting to burn.
A villager reported to the police at LONG BANGER some four kilometres to the north and a helicopter was utilised to take a platoon to the village. Later in the afternoon tracks were found leading back across the border towards the Indonesian kampong of Ba Siok, which lies one kilometre to the east of the border. It was known that there was a detachment of Indonesian Regular Army at Ba Siok.
On the 1 January Security Forces operating near Pa Banger had found and destroyed an Indonesian Army machine-gun post within Sarawak territory, the crew of four all being killed in the action. The attack on the longhouse at Pa Banger appears to have been carried out in retaliation for the destruction of the machine-gun post. The fact that the enemy were armed and uniformed and moved towards Ba Siok after the incident confirms that they came from Ba Siok and were members either of the Indonesian Regular or Irregular Forces.
As a result of this incident a Malaysian Security Force platoon was sent to live in Pa Banger. The local inhabitants decided to send the women and children to the safety of a nearby villag,e while the men would remain and harvest the crops.
30 January, 1964
On the 30 January a small military patrol, operating near Pa Banger to ensure that there were no enemy in the area, made contact with an enemy group of approximately 20 armed with one mortar, several automatic weapons and rifles, all of which were fired in the engagement.
There was an exchange of fire which lasted from 1105 hours until 1330 hours, but due to the dense secondary jungle, and thick foliage, it was very difficult for the two groups to see each other. As a result the firing was sporadic and inaccurate. The Security Forces suffered no casualties. There were no known casualties to the enemy. The enemy were in green uniforms and were accompanied by one civilian in plain clothes who was apparently acting as a guide. A follow-up patrol found the tracks of this group leading southward across the border.
The presence of a guide in civilian clothes indicates that the enemy group were presumably new to the area and unfamiliar with it and therefore had to be guided into and out of Pa Banger. A few empty cartridge cases were recovered from the area on all of which the Indonesian ordnance factory stamp was clearly marked. The initials PSM can be seen on most Indonesian equipment and is used in a similar way to the British WD and arrow sign.