Aegon Targaryen and the Golden Company had managed to take the Stormlands incredibly quickly. It shouldn't have come as such a surprise, especially since almost all of the strength of the Stormlands was spent by Stannis, and the Tyrells had retreated to King's Landing for Margaery's trial. Only a few lords in the Dornish Marches were left, probably because they were quite far away from Storm's End. The Targaryen boy had Jon Connington as Hand and was now raising levies and integrating the stormlords into his army. The Golden Company had taken two hostages from each conquered House to ensure compliance and left them in Storm's End.