What contraband was being transported on the Lusitania?

Answer:
The ship carried 4,200,000 rounds of .303 rifle ammunition.

At the time, Atlantic shipping was being monitored by German submarines to prevent such war materials from being transported.

This was the justification for the sinking of the Lusitania and the death of 1,198 civilans.

First answer by Ixboat. Last edit by Parsecboy. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 6 [recommend question].