Foreign attack was one great disadvantage to the Hanseatic Trade as they had their rivalry with Italian businesses and both were trying for supremacy and monopoly on sea route trade in the 13th Century.And because of foreign attacks,the Hanseatic League became very weak and disbanded. And then British and Dutch businesses took control of shipping in the region.
A secondary source in when you don't get the information from the person who said let's say you asked what's for lunch today and they told someone to tell you fried chicken but they told you chicken sandwich the answer can change before it gets to you.
Look online it will give you the answers