(This is an Anti-aircraft Gun that you can board.)

(To use This Anti-aircraft Gun, you need magic cannonballs.)

(Before boarding, you need to check if you have any magic cannonballs.)

Board the Anti-aircraft Gun. Finish examining.

(This is an Anti-aircraft Gun for defending a fortress.)

(This device is available to members of the legion that currently occupies the fortress.)

Finish examining.