Minecraft wiki entry for Iron_Golem, associated text: When attacking, an iron golem moves quickly toward its target and swings its arms up violently to attack, flinging the target into the air, and dealing 7.5 × 3.75 to 21.5 × 10.75 damage in Normal difficulty. Iron golems have a large attack range, allowing them to attack through a solid 1 block thick wall, even without a line of sight to the target. When an iron golem attacks, it also deals a long knockback range. Iron golems cannot attack targets that are three blocks high above the same ground level as the golem.