Source: Warhammer Armies Project: Unofficial 9th Edition

Forests and Line of Sight
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A forest has a Line of Sight of 5. Models in or behind forests cannot see or be seen through it if there is more than 5" of forest between them and the enemy. If it is less than 5", they can see and be seen through it for all purposes, as long as you can draw a Line of Sight to them as normal. The ‘base’ of the forest is otherwise not considered to block line of sight.

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