The monstrous infantry category covers things like Trolls, Ogres and Minotaurs – creatures that are man-shaped and fight on foot, but are two or three times the size of normal infantrymen. We could perhaps have honestly called this category 'Big Infantry', but it does lack a certain gravitas. For the most part, monstrous infantry work exactly the same as normally infantry (i.e. follow the standard rules) but have a couple of extra facets to represent just how massive they are.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Ranks
As monstrous infantry are so much larger than normal troops, they require fewer warriors to fill out a rank. Where Infantry need at least five models in order to be able to gain rank bonus, a unit composed purely of monstrous infantry needs only three models. Essentially, wherever the rules say 'a rank of five or more models' treat it as reading 'a rank of three or more models'.
Supporting Attacks
A monstrous infantry model can make as many supporting attacks as are on its profile, up to a maximum of three, rather than the usual one supporting attack.
Special Rules
Monstrous Infantry are subject to the following special rules: Fear, Swiftstride.
Unit Strength
Monstrous Infantry have a Unit Strength of 3.
Line of Sight
Monstrous Infantry have a Line of Sight value of 2.
Base Size
Monstrous Infantry have an approved base size of 40x40mm or 50x50mm.