Chapter I - Secrets

The first chest with the scroll is located right behind the exit from the first trenches (near the place where you defend the right flank).

You will find this secret in the camp (in a chest), next to the table with wounded soldier on it.

To get that secret you have to check a dead end path near the place, where Thomas is imprisoned.

You will find the last but one secret in the chest next to the entrance of the river-path, you will cover it in order to get your opponent from behind.

The last desired item is hidden on the rock in the middle of the river, under the bridge which you have to blow up at the end of the chapter.