July 30, 1970: A large-scale dogfight occurred between Israeli and Soviet aircraft, codenamed "Rimon 20", involving 12 to 24 Soviet MiG-21s (besides the initial 12, other MiGs were "scrambled", but it is unclear if they reached the battle in time), and 12 Israeli Dassault Mirage IIIs and four F-4 Phantom II jets. The engagement took place west of the Suez Canal. After luring their opponents into an ambush, the Israelis shot down four of the Soviet-piloted MiGs. A fifth was possibly hit and later crashed en route back to base. Four Soviet pilots were killed, while the IAF suffered no losses except a damaged Mirage. The Soviets responded by luring Israeli fighter jets into a counter-ambush, downing two, and deploying more aircraft to Egypt. Following the Soviets' direct intervention, known as "Operation Kavkaz", Washington feared an escalation and redoubled efforts toward a peaceful resolution to the conflict.