On this day, 21st July, 1977, the Egyptian-Libyan War, or the Four-Day War was fought. It was a short border conflict between Libya and Egypt. The war which begun on 21st to 24th July, 1977, lasted for four days.
The reason for the war was a result of a dilapidation in bilateral relations between the two countries, after Egyptian president Anwar Sadat rejected Muammar Gaddafi’s request to unify both countries. Libyan leader, Muammar Gaddafi, had pursued a peace settlement with Israel in the aftermath of the Yom Kippur War of 1973. Soon thereafter, Libya begun sponsoring dissidents and assassination plot to undermine Sadat, where Egypt responded in kind to weaken Gaddafi.
Early 1976, there were clashes on the border frontiers of Egypt dispatched by Gaddafi, of which Sadat responded by sending more troops to the area to mount a defence. When all this was going on, Egyptian General Staff was devising a system to depose Gaddafi and his men.
The clashes continued in 1977, and pressure mounted on them by the United States, president of Algeria and others brought about a truce forcing Sadat to cease fire and Gaddafi to also soften his rhetoric against Egypt albeit reports indicating that he rallied other Arab States to isolate the country.