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to find a good answer, it would be necessary to find out more about ANE warfare, what equipment the average footsoldier used, how often battles were fought, on what scale, etc. if the majority of the army was equipped with just cloth "armor," a wooden shield, spear, and a short blade of some sort, then it would need a lot less maintenence than a roman legion marching around in chainmail or lorica segmentata with pilum.
Several things here - the average Bronze Age warrior (any nationality) carried a wooden shield with bronze boss, possibly a bronze rim and bronze reinforcements, a helmet of some type (usually boiled bull hide or boar tusk), armor (usually leather, again possibly boiled bull hide, with bronze plates attached, a bronze sword, a bronze knife and finally a bronze tipped javelin or spear. This is not considering the specialized troops deployed such a archers, charioteers, cavalry, and slingers; all of which would require specialized equipment and repair ability. Next, only Imperial Roman Legions wore chain mail and that was 1200 years later. The Gauls were the inventors of chain mail and it wasn't until after the founding of the Empire and the necessity of a standing army (prior to that the Republican soilders were required to furnish their own equipment and only a wealthy man could afford chain mail). Next thing, David supposedly ruled an empire; an empire that was surrounded by several competing empires (Assyrian, Babylonian, Egyptian, ect) all of which maintained a large standing army out of necessity. David would have had to maintain a large standing army also out of necessity. People think that just because these above mentioned empires were quiescient, that they had "shot their wad" for the time being. This is not true, out of necessity they had recalled their out-country based troops to the home land, but they still were powers to be reckoned with. Warfare during that time period was brutal, uncomprimising, and horrifically bloody. There was no "Time out, I have to go plant my crops, shear my sheep, forge new swords, arrowheads and spear heads, butcher oxen for food and cure the leather to repair armor!" A well trained, well supplied standing army was the only way an empire ,such as David and Solomon supposedly ruled , could have continued to exist. As for miracles, that is a typical Christian pipe-dream cop out - we are discussing history and economics here, not mythology - CD