Generally speaking, attackers may use ladders, grappling hooks and siege towers to assault walls. Note that towers are too high to be assaulted with these.

Ladders

As soon as a unit is within base contact of a wall, it may erect any ladders it has. This does not reduce its movement in any way, and the troops may assault the rampart during the same turn. Towers are too high to be assaulted with ladders.

One model per ladder may move onto the ramparts at the start of the Close Combat phase. These models are placed directly above the point where they were on the ground. You may choose any model from the unit to scale the ladder. This allows powerful characters to attempt to take the ramparts, where an ordinary trooper might fail. If the rampart onto which the models move is occupied by the enemy, these models are now in close combat. The defenders will strike first (even if using double-handed weapons) and have the advantage of the defended obstacle bonus, meaning that attackers only hit them on natural 6s. This makes assaulting walls very difficult indeed! Note that these penalties apply each turn unless the attacking model manages to seize the ramparts.

Grappling Hooks

Once a model with a grappling hook is in base contact with the wall he may throw the grappling hook. This is done automatically as soon as the model moves into base contact with the wall. This does not reduce his movement in any way, and he can assault the ramparts during the same turn.

A model equipped with a grappling hook and rope may climb up onto the ramparts. Any model climbing a rope is placed on the rampart at the end of their Move phase. This model is then placed directly above the point where he was when he was on the ground.

If the wall is occupied by the enemy, then they are now in close combat. Models defending the wall strike first (even if they are using double-handed weapons) and have the advantage of the defended obstacle bonus, ie, the attacker hits them only on natural 6s. Note that these penalties apply each turn unless the attacking model manages to seize the ramparts.

Siege Towers

Once a siege tower is in base contact with a castle, any troops from the regiment pushing it can assault the walls. Up to two models can attack the ramparts from a siege tower at any time. Place these models on the drawbridge of the siege tower. The player can choose which models from the unit pushing the tower can assault the walls. This allows the best fighters a chance to clear the ramparts for their comrades.

The siege tower negates all benefits that the defender normally enjoys, so chargers can strike first and suffer no penalties to their to hit rolls, for example. This makes siege towers extremely useful in an assault!

After the initial turn when the siege tower charged in, the attacker may replace any casualties in the normal way, so there will always be two models assaulting the wall from the tower. These models can be freely chosen from the unit.