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All besieging armies know the risk of being outmanoeuvred by a relief column. It is why they keep sentries to ensure that they are at least aware of the movements of said army. And so it is here; scouts have reported that various enemy sentries are keeping a watch on the road.
Most have not been alarmed by your sudden movements north, and those that have were killed to a man in a series of quick but decisive skirmishes. The path is open, and the element of surprise is still firmly in your camp.
But most important of all is the fact that you still have the freedom to manoeuvre. The forest screens your exact movements and location for the time being, and that gives you a strategic advantage in planning your next move.
Freedom of manoeuvre gives you the opportunity to deploy from wherever you wish, save for the part over the river. Where you approach from the north, you would come via the fields and pastures there; it is where the enemy has relatively few men, though apparently there are things that didn't look quite human among them.
Were you to come from the east, the forest could potentially both aid you in hiding until the last second and hinder having troops march in proper formation.
Lastly, the southern approach would also go over open fields as well, straight into the bulk of the enemy army; it would be bold but risky. If properly routed, it would cripple them for the remainder of the battle.
Each had it's own set of advantages, and potential risks and obstacles, as such, weighing your options, you decided to come from.
>The north
>The south
>The East