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In 1868 (or 1869), general Mieroslawski presented to the French army a project of a rolling camp', a modernised version of the hussite tabor (adding of shield-bags, rolling blockhaus, protections against cannonball).
Napoleon III who liked inventions (he had supported the ironclad technology and made the French navy the first in world to launch a battleship with the 'La Gloire', a year before Great Britain) entrusted general Bourbaki with tests which took place in Lyon, but these tests were bungled and the project abandoned.
What if France had adopted these wagenburgs and used them against the Prussians?