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The Iron Warriors are unparalleled masters of siege warfare as well as of building defensive fortifications and fortresses.{{Fn|1c}}{{Fn|1e}}{{Fn|1f}} They frequently set up field fortifications after making an initial landing.{{Fn|1d}} Right after they set up their field fortifications and before the initial bombardment, the Iron Warriors will commonly send infiltration units ahead of the main force to disable the enemy's defenses and defences, set up ambushes and conduct flank attacks while the main force equipped mainly with heavily armored armoured vehicles such as [[Predator]]s, [[Land Raider]]s, and [[Vindicator]]s{{Fn|85b}} charges the fortifications. Their attacks are slow and methodical, and once the enemy is at their mercy they will destroy them at their leisure.{{Fn|1d}} Wherever possible, they make frequent use of the [[Traitor Titan Legion]]s, so much so that some Imperial analysts believe the Titans to be part of the Legion itself.{{Fn|1e}}

The Iron Warriors are expert sappers and engineers and have acquired a variety of siege engines over the years, including [[Termite]]s, [[Dreadclaw]]s, a large assortment of Imperial-made artillery, and [[Leviathan (Transport)|Leviathan]]s. These are used sparingly and are maintained and guarded by the [[1st Company (Iron Warriors)|1st Company]]. Additionally, they use a large number of [[Corvus Assault Pod]]s which allow them to make use of any Titans and use them as mobile siege towers.{{Fn|1e}}

Many who face the Iron Warriors have believed that, due to their emphasis on long-ranged bombardments and grueling sieges, that the Legion can be overwhelmed with a swift assault. The Iron Warriors are thoroughly experienced in brutal, close-quarters combat from their lengthy sieges, and are just as capable of crushing their enemies in hammer-blows of personal combat as they are from exhaustive bombardment.{{Fn|74a}}