MARGATE. — On the 11th April the coastguard having reported a large steamer ashore on the main, the Life-boat Quiver No. 1 was launched at about 3 A.M., and found the steamer European, of Liverpool, bound from London for Antwerp, with a general cargo, stranded on the Walpole Rocks. A moderate N.E. breeze was blowing, the sea was rough and the weather fine and cold. The master of the vessel at first declined assistance, but finding that he could not get his vessel off took the assistance of steam-tugs, and with the help of the Life-boat men and others she was floated on the next tide.