On 20 April 1975, three days after Phnom Penh fell, Pol Pot secretly arrived in the abandoned city. Along with other Khmer Rouge leaders, he based himself in the railway station, which was easy to defend. In early May, they moved their headquarters to the former Finance Ministry building. The party leadership soon held a meeting at the Silver Pagoda, where they agreed that raising agricultural production should be their government's top priority. Pol Pot declared that "agriculture is key both to nation-building and to national defence"; he believed that unless Cambodia could develop swiftly then it would be vulnerable to Vietnamese domination, as it had been in the past. Their goal was to reach 70 to 80% farm mechanisation in five to ten years, and a modern industrial base in fifteen to twenty years. As part of this project, Pol Pot saw it as imperative that they develop means of ensuring that the farming population worked harder than before.