Was that the whole event, one quick act in the dark of night? Read on in Judges chapters 7 and 8. You will see that Gideon pressed the attack.
[‏ ١٩‏] فقد ضرب رجال جدعون الابواق ،‏ كسروا الجرار ليشعّ نور المصابيح ،‏ وصرخوا :‏ « سيف للرب ولجدعون » .‏