Scene Three opens before the gates of Harfleur, where King Henry is warning the Governor and the local citizens of the dreadful things that will happen if the city does not surrender. The king and his men are prepared to show no mercy and will reduce the town to ashes if the Governor does not surrender. The Governor replies that the Dauphin, whom he entreated to come and defend the town, sends word that his forces are not yet ready "to raise so great a siege." He therefore surrenders Harfleur to King Henry and asks for mercy. The king responds by entrusting the town to Exeter and charging him to be merciful to all the people of the city and to fortify it. He will then lead the army to Calais.
Here, in the capitulation of Harfleur, we have the first significant surrender, and we see Henry as a victor for the first time. In this role, he is stern and undeviating in his demands that the Governor surrender the town peacefully. He depicts vividly the many horrors which could result if his demands are not met; yet, in contrast, he is willing to show great mercy if his demands are met. A new note, however, is introduced in Henry's closing speech. Winter is coming, and there is a growing sickness among the men. This problem will remain a constant concern throughout their encampment at Calais, when Henry's men will be seen as only tatters of their former selves.
In the Governor's surrender, we hear that the Dauphin refused to send help. We can assume that the Dauphin has still not taken Henry's threats seriously.