The Battle of the Sand Belt massacre
Hank Morgan, a Hartford arms-factory superintendent transported to 6th-century England, spends years secretly building schools, factories, telegraphs and a newspaper, then declares a republic after Arthur's death. When the Church's Interdict turns the population back against him, he and 52 loyal boys hold a cave ringed by electrified fences, dynamite and Gatling guns and kill about 25,000 armoured knights. The victors are then trapped by the stench and disease of the dead, and the modern project collapses without a trace.