After that event, Einar gave two orders, one strange and the other normal. The first order he gave was that the white deer should be taken care of under any circumstances.
Einar only explained to his soldiers that the deer was a divine sign that things would improve, so he used the excuse that it was a materialization of the Valkyrie Erika.
The Nordic soldiers had no problem believing that, as they had managed to see it many times, not to mention that the soldiers who had entered the castle first claimed that they could see it on skeletons.
The second order that Einar gave was to prepare the castle to establish a base of operations once the kingdom of Oriel was conquered.
From that place, an ultimate attack would be launched against the kingdom of Ulster, so that castle would serve perfectly to coordinate the scouts.