Bows and bullets vs Sand Bags

Years ago I met a girl who lived in Sarajevo during the siege and she told me that they were using bows as well as assault rifles on the front lines as they shot through sand bags and water butts when bullets didn’t - I needed to find out for myself; do arrows do things bullets can’t? I looked at this quickly in an earlier film but guns are tricky here in Europe, so Curt at the the VSO Gun Channel offered to do the firearms side in one film in the US and I did the arrows side over here in the UK and we spl