T. R. Hobbs discusses the use of "sickle swords" (scimitars) in Egypt before the exile.
T. R. Hobbs, “Sword,” in Eerdmans Dictionary of the Bible, ed. David Noel Freedman, Allen C. Myers, and Astrid B. Beck (Grand Rapids, MI: Eerdmans, 2000), 1259 (Logos ed.)
Archaeological excavations have unearthed several types of bronze and iron swords which were used in battle and for ceremonial purposes. The bronze “sickle sword,” frequently depicted on Egyptian reliefs, was used as a badge of rank in the Egyptian army and as a “slashing” weapon with its edge on the outer curve of the blade.