Typically, GM’s won’t want to track the damage done to arms and armor, but from time to time this becomes important. Weapons and armor are designed to take abuse, but anytime they block damage from an opponent’s attack, they will take some damage. Each weapons has a number of Structure Points (or Hit Points if you prefer) equal to 10xAP of the weapon. The amount of damage taken depends on the type of weapon used.

Puncturing1/10
Short Sword, Pole Arms, Arrows, Bolts, Spears

Slashing1/3 (Soft Armors
1/5 (Hard Armors)
One Handed Swords, Daggers, Bastard Sword in one hand

Crushing1/20 (Soft armors)
1/5 (Hard Armors)
Maces, Flails, Clubs

Cleaving Weapons1/2
Axes, Great Sword

Total damage done to the weapons is calculated as follows:
Damage Absorbed x Factor – excess damage blocked.

For example, William blocks the orcs attack. The orc hit for 56 damage with a long sword. William blocked with 5 success with a Round Shield (AP: 5), blocking 25 damage.

The shield shield absorbed 25 points
The long sword’s factor as a slashing weapon is 1/5.
William had no excess damage blocked.
Therefore, the shield take 5 points of damage [25/5 - 0]. It has a total of 50, so it has 45 SP left.

Later that same battle, the orc hits for 15 points of damage. William blocks with 8 successes, blocking 40 damage.

The shield absorbed 15 points of damage.
The long sword’s factor as a slashing weapon is 1/5.
William had 25 [40-15] excess damage blocked.
Therefore, the shield take 0 points of damage [15/5 - 25 = 3-25= -22 = 0]. It still has 45 SP left.

Next to him, Archibald is using his staff (AP: 5) against a large orc with a Great Axe. The orc swings mightily and hits for 65 damage. Archibald blocks 40 damage.

The staff absorbed 40 points of damage.
The Great Axe’s factor is 1/2.
Archibald had 0 excess damage blocked.
Therefore, the staff will take 20 points of damage [40/2 - 0 = 20]. It only had 30 SP, therefore the Orc has broken the quarterstaff in two.