Supported by British parachute drops, EDES quickly gathered some 100 fighters. The first major operation of EDES was "Operation Harling", the destruction of the Gorgopotamos viaduct by a joint force of British SOE commandos, and EDES and ELAS forces. While the successful operation, one of the greatest sabotage acts in occupied Europe, greatly boosted the prestige of the nascent Resistance, it also caused a significant rift between EDES and ELAS: the British loudly proclaimed and lauded Zervas' role in the operation, while ignoring the contribution – numerically far greater – of the leftist ELAS forces. While the rift was healed by British mediation, it presaged the problems that would appear in the future.