It takes a few days, as the summer dries up the grass and the woods. As you continue on through the heat, thankfully there haven't been any outbreaks of disease as of yet. For that would do far more damage to your army than the enemy could ever do.
It was early in the morning when you came upon—or rather, they were marching down the opposite bank of the river. While you came from further away to cross it. So far so good, but what bothers you is that the forest on the opposite banks has turned the only path to the enemy into a bottleneck.
Your moral: High 100/100
Enemy morale: High 100/100
>Order a deployment of the archers to harass them, make them come to you.
>Ford over the river, engage them there.
>Write-in.