In late March 1993, the Armenians kicked off a new offensive in the north aimed at opening a second supply route from Armenia. Operation Kelbajar involved a four-prong attack which was successful in routing Azerbaijan's 2nd Army Corps and securing control of the region. Armenian Air Force losses for amounted to one Mi-8 helicopter (on 16 April). No aircraft losses were suffered during the subsequent summer offensives of 1993 or in the next year's actions preceding the ceasefire of 16 May 1994.