6 February, 1964
On 26 January, 1964, Security Forces started an operation to locate the infiltrators in the Sematan area. On 6 February a section of Security Forces searching in dense jungle eight kilometres due south of Sematan found an ambush position. This was well within the Malaysian border. As the Security Forces approached along the tracks one of the infiltrators in the ambush coughed and thereby unwittingly gave warning to the Security Forces. The infiltrators were in lndonesian military uniform and opened fire at the patrol with rifles. Fire was exchanged for 15 minutes before the infiltrators withdrew South towards the border leaving behind one dead man. The Security Forces on searching the ambush found 597 rounds of unused ammunition of a type used by the Indonesian Armed Forces. Tracks for about 30 people were followed heading in a southerly direction but after 100 metres they were lost due to heavy rain and flooding.

8 February, 1964
Patrolling was continued on 8 February and an empty camp was located one kilometre to the west of the ambush position. The camp had been used up to three days previously and could have accommodated about 30 to 40 persons. Twenty-four mortar bombs marked IA Mark 1 plus 774 rounds of ammunition were recovered. Tracks for about six people were followed with the aid of tracker dogs but the tracks were lost in a mangrove swamp about 60 metres south-east of the camp. At the camp a military flash (badge) belonging to 622 Battalion of the Indonesian Army, a second class private TNT flash and a Partindo membership card were recovered together with part of a TN1 military manual dealing with field defences. There was also a sketch of Kampong Pueh showing Security Force positions.

15 February, 1964
Lundu - On 14 February at one o’clock in the morning two Sarawakian Dayaks from Pasiar Tengah a small village near Lundu reported to Security Forces that there were two uniformed enemy hiding in a padi field just to the south of the village. The two Dayaks had broken the curfew in order to pass this information to the authorities. A small patrol was at once sent out and the two uniformed enemy were captured at 0215 hrs and taken to Lundu. On being questioned they stated that they belonged to No. 3 Platoon of ‘A’ Company Pasokan Marimau Sukarelawan which is an Indonesian irregular force and had been ordered to infiltrate into Sarawak on 12 February. They were under orders to remain in First Division until those on WPS, Indonesia had liberated Sarawak. ‘The two prisoners are men of inferior calibre and had deserted from their unit a few hours prior to capture. Their names are Anting ak Entut and Amat bin Aser, they being Indonesian Land Dayaks. Neither had a weapon with him when captured. They said they had left them in the unit camp when they deserted.

20 Fehurrary, 1964
Sematau-kudu area Kuala Sekambal is a small village eight kilometres east of Sematan in First Division and 10 kilometres from the Jndonesian border. The village consists of eight or nine houses and is surrounded by jungle. On 20 February after mid-day four members of Security Forces under a sergeant were sent to Kuala Sekambal to carry out an identity card check. This is a routine method employed to discourage Indonesian infiltrators from forcing villagers to hide and feed them. After they had checked all the other houses they arrived at the last house in the village and were invited by the male Chinese occupant to enter and have a drink of coffee. The four soldiers unsuspectingly went in and sat around the table. The sergeant had not entered; he put his rifle against the door post and took two steps out into the road.

As he did so out of the darkness he saw a man in uniform and carrying a sub-machine gun coming towards him. The sergeant turned quickly and shouted a warning into the house and at the same time stepped back to grab his rifle. Before he could reach it he was shot in the back and killed. The occupant of the house had quietly stepped out. At the same time five or six other enemy had crept up to the house and had pointed their sub-machine guns through the open windows and fired into the room wounding all the soldiers. Although wounded they managed to grab their rifles and fight off the enemy, wounding at least two of them.

The enemy were in clean jungle green uniforms and did not look as if they had been living under hard conditions in the jungle. The local villagers here who are predominantly Chinese, appeared to be aware of the presence of the enemy group and had deliberately trapped the members of Security Forces into entering the house. The Security Forces party had been in the village for four hours; they had visited all the other houses to check identity cards. It was therefore known to everyone in the village who and what they were and what they were doing. The incident must therefore be a pre-planned hostile act. Automatic weapons and ammunition are not obtainable in Sarawak and must have come from Indonesia. A search of the village was carried out and one TN1 peaked cap with the letters ‘TNKU’ written on the peak was found. Also recovered were 11 rounds of 9 mm submachine gun ammunition. Three of the rounds wcrc of Indonesian manufacture and bore the Indonesian Ordnance stamp ‘PSM 62’.