The Conqueror is supremely skilled in many styles of fighting, be it with sword and axe, or sword and shield.
Source: Warhammer Fantasy: 6th Edition
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With his sword and axe, Crom is a whirlwind of destruction, his attacks striking with such power that his opponents are torn apart by the storm of blows. If Crom fights with a sword and axe then he gains +1 Attack for an additional hand weapon as normal. In addition, if he fights with a sword and axe in a challenge, Crom may make an additional attack for each wounding hit he makes (before saving throws).
Crom uses his shield expertly, forcing his opponent back and blocking any attempt to launch an attack. If Crom fights with sword and shield he gets the normal + 1 to his Armour save for using a hand weapon and shield. In addition, if he fights with sword and shield in a challenge, any special rules applying to Crom's opponent's weapon are completely nullified; in other words his opponents always count as using a single hand weapon regardless of their actual equipment. This applies to both magical and mundane equipment.