Half a mile might be a bit of an exaggeration and pianos are not the ideal missile but they were very effective machines. They have a full size working model at Warwick castle and I watched a demonstration last year. Rather graceful to watch - Like a very slow bowler!
Build your own:
www.amazon.co.uk/gp/search/ref=pd_lpo_ix_dp_am_us_uk_en_trebuchet_gl_toy?keywords=trebuchet&tag=lpo_ixdpamusukentrebuchetgl_toy-21&index=blended
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