Nonetheless Charles managed to impress twenty - eight boats at Rouen and cross the Seine on March 31 .
In March 841 , they moved to block Lothair 's brother and rival , Charles the Bald , from crossing the flooded Seine by destroying boats and bridges .
Charles the Bald managed to impress twenty - eight boats at Rouen and cross the Seine on March 31 .
In March 841 , they moved to block Lothair 's brother and rival , Charles the Bald , from crossing the flooded Seine by destroying boats and bridges .