Some weapons give their wielders a Strength bonus in close combat or when shooting. This is clearly indicated in the weapon's profile. For example, a halberd has a +1 Strength bonus, so if used in close combat by a warrior with a Strength of 3, any hits caused are resolved with a Strength of 4. Note that this Strength bonus only applies when the warrior is using the weapon - his Strength characteristic remains unchanged for other purposes.