I should add that they were donated to the WWII metal drive with the provision that they be replaced with more modern war trophies. What sits in their place are Type 92 Battalion Guns, the wooden wheels of which rotted and were replaced with metal wheels.
Another thing of interest I found in the files I sorted through was a clipping from 1934. Seems like some people had been saying that the howitzers should go because they promoted war and violence. The clipping was a letter to the editor arguing that the howitzers should stay. Some things never change, do they?