De Ladebat was President of the Council of Ancients at the time of the 18 Fructidor coup against the new moderate majority on the Councils. He was later deported to French Guiana with sixteen other deputies. He would remain in exile at Sinnamary for over two years with several other deportees, including General Pichegru. Of the sixteen deported to Sinnamary, eight died there or while escaping, six escaped successfully, and two were finally recalled to France.