Boirault machine, an experimental landship built by the French in 1915.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...1_fullsize.jpg
Previously:
WWI Pedrail Machine armored fighting vehicle - photo
WWI Tsar Tank - photo
1917 tank demonstration - photo
WW2 Bob Semple tank - photo
WWI U.S. Army steam tank - photo
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