Harfleur's defences and disease break Henry's invasion plan

Harfleur's strengthened defences turn an expected capture into a siege lasting until 22 September. English losses come from cannon and crossbow fire but especially from disease, identified as probably dysentery. After the surrender, Henry takes valuable hostages, spares poorer inhabitants, allows some to remain, and reallocates elite houses to English occupants. With roughly a third of his army dead and more soldiers evacuated sick or retained as a garrison, the planned advance on Paris becomes impossible. Disease, garrison demands, and occupation choices undo the invasion timetable even after a military victory.