It did, the Soveit-made SAMs racked up a large number of kills against the Israeli-airforce and the IDF was beating itself bloody the Egyptain defences.
Only in the initial stage, like the first day or two basically, when the Israelis conducted their first counterattack. After that attack failed, the Israeli's took stock, realised their errors, & altered their tactics accordingly. Yet even if the Egyptains hadn't conducted their ill-advised attack towards the passes, the Egyptains fate would have been repeated anyway due to the fact that the Israeli tactics, in dealing with the Egyptain tactics, had been dramatically revised whilst the Egyptains clung basically to their defensive orientated positions.
Then the Egyptains got overconfadent and went on the offensive too soon, quickly moveing beyond their SAM shield after that the Israeli-airforce bombed them relentlessly.
This is basically wrong on two counts actually. First was the Egyptains didn't get overconfident. In fact the Egyptain GOC, General Shazly, didn't want to advance beyond the SAM umbrella. The Egyptians were forced to do so because the Syrian offensive had, not only failed in trying to take the Golan Heights, but the Isrealis had conducted a counter-offensive against the Syrians & they were in extremely deep trouble.
Secondly, as I said, by this stage of the game the Isrealis had changed tactics, meaning that the Egyptain SAM unbrella no longer had the impact that it had a few days earlier. And this was most relevant when Sharon lead the initial stage of the counterattack which separated the Egyptain 2nd & 3rd Armies before the crossing of the Suez Canal. Then, after the crossing, the main targets of the Isreali army were all those SAM sites...
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