Being too heavy to jump up and down as a normal Giant might when moved to a frenzy of violence, the Siege Giant however does its best to mash anything close underfoot and flail blindly with its oversized weapons.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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First test to see if the Giant falls over, with any wounds caused if they do counting towards the combat result. If the Giant remains on its feet, select a target unit in base contact. That unit sustains 2D6 Strength 6 automatic hits as the armoured bulk of the Giant batters them into the ground.