In the spring of 1529 Suleiman marched north up the Danube with a huge army. His goal was Vienna, the city of the Habsburgs.
But it was one of the wettest summers anyone could remember. Roads turned to mud, rivers flooded, and the heavy siege cannon had to be left behind. The army reached Vienna only in late September.
For three weeks the Ottomans dug mines under the walls, and the defenders dug countermines. With winter coming and supplies running out, Suleiman ordered the retreat. Vienna had survived, and the high tide of the Ottoman advance into Europe had been marked.
