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In page Six-Day War:

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Two armored brigades in the meantime, under Avraham Yoffe, slipped across the border through sandy wastes that Egypt had left undefended because they were considered impassable. Simultaneously, Sharon's tanks from the west were to engage Egyptian forces on Um-Katef ridge and block any reinforcements. Israeli infantry would clear the three trenches, while heliborne paratroopers would land behind Egyptian lines and silence their artillery. An armored thrust would be made at al-Qusmaya to unnerve and isolate its garrison.[citation needed]