She only surrendered when Henry began the siege of Le Puiset and swore to slaughter all the inhabitants .
He returned to besiege his mother at Poissy but Constance escaped to Pontoise .
Constance only surrendered when Henry began the siege of Le Puiset and swore to slaughter all the inhabitants .
He returned to besiege his mother at Poissy but Constance escaped to Pontoise .