Source: Warhammer Fantasy: 4th Edition

Weapons Modifiers (Hand-to-Hand Combat Phase)
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Unlike shooting it is the strength value (S) of the attacker which is used rather than the strength of the weapon itself. However, some weapons confer a bonus on the attacker's strength. For example, charging knights with lances receive a +2 bonus on their strength. These bonuses are discussed together with other special rules in the section on Weapons.