Soldiers’ Preparations Prior to Battle

במדבר לב,כא : וְעָבַר לָכֶׁם כָל-חָלוּץ אֶׁת-הַיַרְ דֵּן לִפְ נֵּי ה' עַד הוֹרִ ישוֹ אֶׁת-אֹיְבָיו מִפָנָיו :
Baal HaTurim comments that the same word חלוץ appears in Parshas Ki Seitzei (25:10), in connection with the Mitzvah of Chalitzah " ... beis chalutz ha'na'al", though there it means 'the house of the one whose shoe was removed'.
As is well-known, David ha'Melech's soldiers used to hand their wives a Get before going to war, in order to dispense with the need for his brother to make Yibum or Chalitzah, should he die in battle,
From here, says the Baal haTurim, we learn that Moshe Rabeinu's soldiers used to do the same thing, and that presumably, Dovid haMelech took his cue from Moshe Rabeinu.