With these lessons in mind Alfred capitalised on the relatively peaceful years following his victory at Edington with an ambitious restructuring of Saxon defences. On a trip to Rome Alfred had stayed with Charles the Bald and it is possible that he may have studied how the Carolingian kings had dealt with Viking raiders. Learning from their experiences he was able to establish a system of taxation and defence for Wessex. There had been a system of fortifications in pre-Viking Mercia that may have been an influence. When the Viking raids resumed in 892 Alfred was better prepared to confront them with a standing, mobile field army, a network of garrisons and a small fleet of ships navigating the rivers and estuaries.