[13:18] 1 tn The Hebrew term יַם־סוּף (Yam Suf) cannot be a genitive (“wilderness of the Red Sea”) because it follows a noun that is not in construct; instead, it must be an adverbial accusative, unless it is simply joined by apposition to “the wilderness” – the way to the wilderness [and] to the Red Sea (B. S. Childs, Exodus [OTL], 217).
[13:18] 2 tn The term חֲמֻשִׁים (khamushim) is placed first for emphasis; it forms a circumstantial clause, explaining how they went up. Unfortunately, it is a rare word with uncertain meaning. Most translations have something to do with “in battle array” or “prepared to fight” if need be (cf. Josh 1:14; 4:12). The Targum took it as “armed with weapons.” The LXX had “in the fifth generation.” Some have opted for “in five divisions.”
