Source: Warhammer Armies Project: Unofficial 9th Edition

Obstacles and Movement
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If a cavalry, monstrous cavalry, chariot or shrine model marches, charges, flees, pursues or overruns over an obstacle, or charges an enemy on the other side of an obstacle, it must take a Dangerous Terrain test.

Obstacles do not otherwise impede movement. If a unit ends its move with some of its ranks or files on different sides of the obstacle, simply place the models appropriately on both sides of the obstacle – the unit suffers no ill-effects.

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