Operation GYS, or Operation Gayis , 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. When the military operation (later called GYS 1) commenced and failed on July 27, 1948, a more modest operation (GYS 2) was attempted on July 31, aimed just to transport goods to the enclave.