The cuneiform ru sign is found in both the 14th century BC Amarna letters and the Epic of Gilgamesh.
In the I-XII Tablets of the Epic of Gilgamesh, it has specific uses showing alternate renderings besides ru; as sign no.
The scribal rendering of the ru sign is dramatically different in some of the Amarna letters.
The alternate rendition of the sign as shown in Amarna letter EA 364 is also found twice in the mid-length (to long) 69-line Amarna letter EA 362, Rib-Hadda to Pharaoh, used as "to send" (a letter/message), line 52, "aš-pu-ru", Akkadian "šapāru".
Henceforth, Amurru remained firmly in Hittite hands until the reign of the 19th dynasty Pharaohs Seti I and Ramesses II.