Operation GYS, or Operation Gayis (Hebrew: מִבְצָע גַּיִ"ס), short for Golani, Yiftach, Sergei (Negev)—the three participating brigades—was an Israeli military and logistical operation conducted during the second truce of the 1948 Arab–Israeli War. Its objective was to create a corridor to the Israeli enclave in the northern Negev desert, surrounded by the Egyptian army.