Operation Storm started at 5 a.m. on 4 August 1995 when coordinated attacks were executed by reconnaissance and sabotage detachments in concert with Croatian Air Force (CAF) air strikes aimed at disrupting ARSK command, control, and communications. UN peacekeepers, known as United Nations Confidence Restoration Operation (UNCRO), were notified three hours in advance of the attack when Tuđman's chief of staff, Hrvoje Šarinić, telephoned UNCRO commander, French Army General Bernard Janvier. In addition, each HV corps notified the UNCRO sector in its path of the attack, requesting written confirmations of receipt of the information. The UNCRO relayed the information to the RSK, confirming the warnings RSK received from the Yugoslav Army General Staff the previous day.