In battle near Hoogwoud on 28 January 1256, William tried to traverse a frozen lake by himself, because he was lost, but his horse fell through the ice.
Dne 28. ledna 1256, v bitvě poblíž Hoogwoudu, se sám pokusil přejít zamrzlé jezero, protože se ztratil, ale jeho kůň byl těžký a led se prolomil.