The national humiliation of the Macedonian conflict, together with the resentment in the army against the palace spies and informers, at last brought matters to a crisis. The Committee of Union and Progress (CUP), a Young Turk organization that was especially influential in the Rumelian army units undertook the Young Turk Revolution in the summer of 1908. Abdul Hamid, upon learning that the troops in Salonica were marching on Istanbul (23 July), at once capitulated. On 24 July an "irade" announced the restoration of the suspended constitution of 1876; the next day, further "irades" abolished espionage and censorship, and ordered the release of political prisoners.