Thailand's 1949 Palace Rebellion was a failed coup attempt. The aims of its plotters were to overthrow the government of Field Marshal Plaek Phibunsongkhram and to restore his main civilian rival Pridi Phanomyong to the Thai political scene. The rebels managed to escape in naval vessels across the Chao Phraya River, and navy units engaged the army in fierce street fighting. A ceasefire was declared that afternoon, although it would take the navy and the army a full week to negotiate a resolution to the crisis.