Married Soldiers during wartime in the Old Testament

In doing some biblical history I have found that during Old Testament Times that marriage laws were not only strict, but very much one sided (Aimed at giving a male superiority). One discussion that presents itself is what a soldier must do with his wife when he must go off to war. There is no direct reference (from what I can find) in the Bible to this scenario, and a slight inference given to this in the Talmud. According to Jewish Law, if a man disappears or deserts his wife, or is presumed dead but there is sufficient proof of of death, a woman is considered an agunah (literally anchored). To prevent this problem (to some extent) it is customary in many places for a man to give his wife a conditional GET (Cermonious Divorce) whenever he goes off to warso that if a man goes off to war and never comes home and/ or his body is never found his wife does not become an agunah.
NOW, the question is: can you guide me towards the one of the 600 plus laws present in the Holy Bible that may be connected to this interpretation.