It is time: What does Devorim have to do with anything? It has nothing to do with an Army, but with horses, wives and gold. Also, after Saul, Israel had a regular standing army in addition to citizen solders were required to serve to fill the ranks. In Malachim 1, Perek 10 has Shlomo Hamelech have 1400 chariots and 12,000 horsemen. The pasuk says he stationed them in certain cities to show that this is a REGULAR STANDING ARMY who were stationed throughout Israel and not just Citizen solders who are called into battle..
