..and some barrows were used for target practise like the Butt hill: http://www.themodernantiquarian.com/site/7082
or are butts in folklore at least
http://www.themodernantiquarian.com/site/3515
http://www.themodernantiquarian.com/site/5017
http://www.themodernantiquarian.com/site/2908
http://www.themodernantiquarian.com/site/4214