On 13 October 1945, one of the Dutch officials following the British to the city centre stole a teenage boy's red-and-white (the
flag of Indonesia's colours) badge just outside the Medan Hotel, located at Bali Road, and trampled on it. This sparked violent clashes, which turned into a battle. Similarly in
Berastagi, a town several kilometres away, several British soldiers lowered the flag of Indonesia outside a government building, and the ensuing clashes killed them. The
Indonesian Army launched attacks against troops from the Allies and the NICA in an effort to seize government buildings formerly occupied by the Japanese. The British delegation issued an ultimatum to the Indonesian people to disarm and hand over their weapons to the Allies, which was promptly ignored. , Head of the Dutch
Roman Catholic State Party (RCSP), inspects wounded Dutch and Indonesian soldiers during his visit to the Dutch East Indies, in 1946 On 1 December 1945, the Allies attempted to create a
buffer zone and planted signs inscribed with the message "Fixed Medan Area Boundaries" in the outskirts of Medan. Nine days later, on 10 December 1945, the Allies and the NICA launched a massive attack against Indonesian troops stationed in Medan. The attack caused many casualties on both sides. Kelly then handed control of the areas outside Medan to the Japanese general
Moritake Tanabe, while Medan was still under Allied control. While succeeding in making some Japanese soldiers flee, others resisted, leading to a four-day clash that killed around 3,000 locals and 250 Japanese. Violence in Medan continued until April 1946, when the Allies succeeded in occupying the city, and Indonesian forces retreated to
Pematangsiantar. Gradually, the Dutch took over the entirety of Medan until the end of their rule in Indonesia in 1949, and the British withdrew. ==Aftermath==