A relevant passage from the rules:
- Quote :
- A charge is like a running move, performed at double the Movement rate, but ends with the attacker moving by the most direct route into base-to-base contact with the enemy model. Once their bases are touching they are engaged in hand-to-hand combat. Models are also considered to be in hand-to-hand combat even when separated by a low wall or obstacle, where it is impossible for the bases to touch physically because the obstacle is in the way.
So you can't stop somebody from attacking you
solely by preventing them from touching their base to yours. For example, standing against a window or a low wall implies somebody can charge you if they see you and stop right next to you but separate by a sliver of a millimeter of cardboard and still attack you; if you're standing on a step 1mm above the ground, you're not immune to close combat since somebody can stand on the ground 1mm below you and attack you. An obstacle or low wall doesn't block somebody from charging you, whereas a
real wall or a chasm might.
Another rule elsewhere instructs you to
"treat ladders like open ground," i.e. you can walk or even run up them if you have 3" of movement without requiring a climbing test. The ruling here allows you to use ladders to connect places that might be difficult to get to otherwise, building "emergency stairs" to place that
would be blocked by people taking up space at edges or getting in the way otherwise. You're probably fine walking partway up a ladder, stopping there (since it's "open ground"), and taking a few swings at somebody.