Sudirman met with Sukarno in Jakarta, then President Sukarno asked him to them against the forces of Japan in the city, but refused on the grounds the Sudirman were not familiar with the environment in Jakarta. Sudirman joined his army in Kroya on August 19, 1945.Sudirman and several colleagues of our fellow soldiers MAP established BKR branch in Banyumas in late August, after earlier visiting Kroya and learned that the battalion there have been dissolved. His encounter with the Commander of the region of Japan, Saburo Tamura, and resident of Banyumas, Iwashige. He and Iskak Cokroadisuryo forced Japan to surrender and give their weapons. Most of the weapons used by the unit and the rest of the Sudirman BKR distributed to other battalions.On October 5, President Sukarno issued a decree forming the people's Security Army (TKR) consists of TKR land, Sea, and TKR TKR Flight Office. TKR functions, namely to maintain independence and to keep the people of Indonesia. Oerip He set as temporary leader.United Kingdom forces, managed to disarm the army of Japan and the Netherlands, while prisoners of war arrive in Semarang, and later moving towards. When the United Kingdom began to rearm the Netherlands soldiers became prisoners of war and it seems like is preparing a military base in Magelang. Sudirman mengirim beberapa pasukannya di bawah pimpinan Letnan Kolonel Isdiman untuk mengusir mereka; misi ini berhasil, dan tentara Eropa menarik diri dari Ambarawa, di tengah-tengah Magelang dan Semarang. Pada 20 Oktober, Ia membawahi Divisi V setelah Oerip membagi Pulau Jawa menjadi divisi militer yang berbeda.Pada tanggal 12 November 1945, Sudirman terpilih sebagai pemimpin TKR saat berusia 29 tahun, melalui pemungutan suara yang berlangsung dua tahap. Ia berhasil mendapat 22 suara sedangkan Oerip hanya mendapatkan 21 suara. Ia tetap menunjuk Oerip sebagai kepala staff kemudian Sudirman dipromosikan menjadi Jenderal.Tentara gabungan antara Belanda dan Inggris telah mendarat di Jawa pada bulan September, dan pertempuran besar telah terjadi di Surabaya pada akhir Oktober dan awal November. Ketidakstabilan ini, serta keraguan Soekarno atas kualifikasi Sudirman, menyebabkan terlambatnya pengangkatan Sudirman sebagai pemimpin TKR.
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