If by some repeal of the laws of
physics you do manage to get your land fortress to actually move, why
stop at making it into a tread-mounted battleship? Make full use
of those mudguards and turn it into an aircraft carrier!
Mind you, turning it into the
wind could be a mite tricky.
But where land
fortresses go, other intrepid machines of war are sure to follow.
Don't forget those amphibious submarines complete with heavy artillery
and machine gun turret.
And right
behind is the death-ray "lightning thrower."
And finally,
the giant, automatic trench digger, so you can set the stage for
another First World War-style impasse that much more efficently.
And it shows up
again in 1934. 
But where land
fortresses go, other intrepid machines of war are sure to follow.
Don't forget those amphibious submarines complete with heavy artillery
and machine gun turret.
And right
behind is the death-ray "lightning thrower."
And finally,
the giant, automatic trench digger, so you can set the stage for
another First World War-style impasse that much more efficently.