Israeli aerial supremacy prompted Egypt to turn to the USSR for assistance and by the spring of 1970 an entire Soviet air defence division had deployed to Egypt. The Soviet presence spelled the end of "Priha" and Egypt regained the initiative, rolling its air defence array towards the Suez Canal. The IAF sought to hamper these advances through a renewed SEAD campaign and 69 Squadron saw repeated action against Egyptian air defences and related infrastructure. Egyptian SAMs, however, soon exacted their toll on the attackers, with Rami Harpaz and Achikar Eyal falling into Egyptian captivity on June 30, a fate shared by Amos Zamir and Amos Levitov on July 5. AN/ALQ-71 Electronic countermeasures (ECM) pods were soon rushed to Israel but proved only partially effective against surface-to-air missiles. On July 18, the IAF attempted to fly eight F-4 Phantoms in close-knit pod formations thought to maximize the effect of the ECM pods, only to lose 201 Squadron leader Shmuel Hetz, while an injured Avihu Ben-nun was forced to crash land his badly damaged aircraft at Rephidim.