Indonesian forces consisted of 20,000 soldiers from the newly formed "Tentara Keamanan Rakyat" (TKR; People's Security Armed Forces) from its East Java Regional Command and an estimated 100,000–120,000 irregulars and militias. The TKR was formed partly by the former members of "Peta", a semi-military organisation during the Japanese occupation and a few local officers of the former KNIL. The irregulars consisted of pro-Independence mobs, armed with rifles, swords, and bamboo spears. Some of their weapons were taken from surrendered Japanese troops.