At a meeting with Central Java governor Wongsonegoro, agreement was reached that the Indonesian police would be allowed to keep their weapons, but that civilians would be disarmed.

[3] However, when Allied and NICA troops began freeing and arming freed Dutch POWs in Ambarawa and Magelang, many locals were angered.

1st Central Kedu Regiment under the command of Lieutenant Colonel M. Sarbini began besieging Allied troops stationed in Magelang in reprisal for their attempted disarmament.

Indonesian president Sukarno intervened in the situation to calm tensions, and the Allies secretly left Magelang to their stronghold in Ambarawa.

Since the death of Lt. Col. Isdiman, the Commander of the 5th Banyumas Division, Col. Soedirman felt the loss of one of his best officers and he immediately took to the field to lead the battle.

Colonel Soedirman, vowed to avenge Isdiman's death and called in reinforcements to besiege Allied positions in Central Java.

In this assault the Indonesian forces managed to ambushed and attacking the British-Gurka and Dutch forces, to countered this assault the British called some air support,in the aerial attack the British aircraft bombed the village in Magelang and killed tenth Indonesian soldier and hundreds of civilians.

The convoy was backed by one P-51 Mustangs and then the companies led by Second Lieutenant Suwarno attacking the convoy and Major Soeyoto also joined,in this ambush the Indonesian forces succeeded to inflicted heavy casualties and many of the allied supplies was destroyed,unfortunately the Suwarno and Soeyoto was killed after dueled with Gurkha's and Japanese POW's.