A door may be forced by breaking either its locking mechanism (latch,
lock, bar) or the door itself.

The weaker of the two elements breaks when sufficient force is ap- plied.

The strength of various types of doors, locks, and walls are given in the
table below.

This table assumes that the door can be opened in the direction it is forced:

if the doorframe precludes this ignore the strength of the lock ~ the door
itself must be battered down.

Castle and fortress gates (but not portcullis or drawbridges) open in
either direction.

Door, Wall, And Lock Strengths Doors Walls Holding Mechanism
1/2"thick(houseorhut) 3 6" adobe 60 wood latch 2 1" thick (building) 8 6"
brick 70 metal deadbolt 10 1.5" thick (fort interior) 26 6" stone & mortar
100 sliding drop bar 6 2" thick (fort exterior) 54 l' large stone 720
heavy drop bar 30 3" thick (fort gate) 102 2' large stone 2000 4 man bar
(gates) 125 4" thick (fort gate) 160 4' large stone 5600 6 man bar (gates)
220 8" thick (castle gate) 450 8' large stone 16000 two 6 man bars 440
After finding the strength of the door and lock determine the ..attack"
force by adding together all applicable modifiers from the following table.

+ 1 for every 5 points of Strength -5 door or wall barricaded + 1 hitting
at Combat Speed (CS) + 4 light ram (4 man) + 3 hitting at 2 x CS + 20
heavy ram (16 man) + 5 hitting at 3 x CS + 120 catapult + 1900 trebuchet
Add the Strength and movement modifiers for each man on a ram to the total.

If the attack force is greater than the door's or lock's strength, the
door is forced open.

If the attack force is greater than the wall's strength, the wall is broken.

Even if the attack force cannot immediately break the obstacle, the attack
will damage it.

Subtract the (attack force)/ 10 from the door, wall, or lock strength with
each battering.


09.07-breaking_down_doors_and_walls.txt