Two Enemies

כי תצא למלחמה על איביך ונתנו ה אלקיך בידך ושבית שביו

The possuk first identifies the enemies in the plural form and then changes to the singular form, ונתנו, why the switch? (The Baal HaTurim says איביך in missing a י but that is not how we have it, see Minchas Shai.) The Kli Yakar explains that there are two enemies, there is the enemy that the war is being waged against, the external enemy and then there is the internal enemy, the fight with the yetzer harah. These two approaches carry over into the next pessukim. The parsha of יפת תואר on the first level of the general war against the enemy speaks of a situation of לא דברה תורה אלא כנגד יצר הרע. On the level of a personal fight the Or HaChayim explains the יפת תואר refers to trapping the sparks of kedusha that one elevates by abstaining from sin.