Trieste, 18 April. The Imperial blockade squadron consisting of a corvette, 3 brigs, a goelette and a steamboat left yesterday the harbour of Pirano going towards Venice. Today followed the frigates Bellona and Benere and the corvette Bellona. Unexpectedly arrived 15 April two Sardinian steamboats of war off Pirano where they anchored, one stayed there until midnight.