Especially, concerning battles or wars, it is said that the term 'ikusa'(射交矢) comes from the words '射交わす矢(いくわすさ)' (ikuwasusa, that is, arrows which are shot) (the word "矢・箭" is pronounced as "sa" in the ancient word).
特に戦に限っては「いくさ」の語源が弓で矢を放ち合う事を表す「射交わす矢（いくわすさ）」（矢・箭は古語ではサと読む）が、「いくさ（射交矢）」に変化したといわれる。