Italian blockade of the Adriatic was to be raised immediately according to the Weekly Intelligence Summary No. 15 for the week ending 29 March 1919

An item reported that the Admirals’ Committee advices to raise immediately the Adriatic blockade and which the Italian government agreed from 30 March on. A new list of contraband was made and the right of search and prohibition of change of flag of ships of the enemy remained in force. The advice was a result of evidences now known during the enquiry at Spalato.

Source

The National Archives, Kew Gardens, England CAB-24-77-68