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As the Hòa Hảo began battling the French, they also came into conflict with other military organizations such as the Việt Minh and Cao Đài who were also fighting the French. The Hòa Hảo were in control of most of the Mekong Delta and was unwilling to toe the Việt Minh line from Hanoi. On 9 September 1945, a confrontation arose when a band of 15,000 Hòa Hảo, armed with hand-to-hand weapons, attacked the Việt Minh garrison at Cần Thơ. With their antiquated weapons, Sổ's men were slaughtered, losing thousands. Sổ's brother and the brother of his commander Soái were captured and executed. The return of French forces helped to keep the Hòa Hảo and the Việt Minh apart, but the Hòa Hảo periodically sought vengeance on the Việt Minh by tying sympathisers together and throwing them into the river to drown. The Việt Minh were worried by Sổ's nationalist credentials and social structure, and attempted to co-opt him into a National Unified Front. It was dissolved in July 1946 after it was apparent that Sổ would not follow the Việt Minh. Sổ entered politics openly by creating the Viet Nam Democratic Socialist Party, known as the Dân Xã. This defiant move made him a target of the Việt Minh as relations deteriorated.