https://en.wikipedia.org/wiki/Napoleon#Exile_on_Saint_Helena
https://en.wikipedia.org/wiki/M1_Abrams#Design
https://ageofrevolution.org/200-object/british-cannon-9-pounder/
https://www.britishbattles.com/napoleonic-wars/battle-of-waterloo/
https://www.gd-ots.com/munitions/large-caliber-ammunition/120mm-m1028/
https://en.wikipedia.org/wiki/Battle_of_Waterloo