bar shot

:  a cannon shot consisting of two spheres or hemispheres united by a bar and formerly used in naval warfare It should also be noted that bar shot was effectively employed against the rigging and sails of enemy ships only at close range, as this type of artillery projectile was quite inaccurate because the round spun once it had been fired. — Douglas R. Cubbison, The American Northern Theater Army in 1776, 2010; also :  a discharge of such shot