The Flag Incident was the tearing of the blue part of the Dutch flag leaving red and white colors at the Yamato Hotel on September 19, 1945. This incident occurred due to the wishes of the pro-Dutch group, they intended to show dominance which was then reacted strongly by the youths of Surabaya. The figures involved included MR Ploegman, Resident Soedirman, Bung Tomo, Abdul Wahab, Sidik, Harijono, Budi Tjokrodjojo, Sudi Suyono, etc. This incident became the starting point for igniting the fire of revolution in Surabaya.