 In May, the Japanese sent a 400-strong unit to engage the Dutch guerrilla force of 125 soldiers who withdrew and continued their fight inland.De Jong and van Daalen created two groups and based themselves each in the east of Poso and around Kolonedale respectively.On 9-10 June, de Jong's group came upon a National Administration's radio station in Kolonedale and establish contact with Dutch representatives in Australia, requesting food, weapons and ammunition.