Show PLANS PERFECTED TO BEAT I BOATS U-BOATS GERMAN SUBMARINE OPERATIONS OPERATIONS OPERA OPERA- HAMPERED BY DARING RAID B BY BI BRITISH Sinking of Old Boat May Block Harbor Harbor Harbor Har Har- bor and Cause Removal of Hun Submarine Base Greatest Greatest Mine MineField MineField MineField Field in World Sown II London German German submarine operations operations operations opera opera- from the harbor harbor- of Ostend Belgium Bel- Bel glum gium have been seriously hampered for a time If It not rendered impossible by a daring daring raid made last week upon the by the British An official official official cial statement issued Saturday by the British admiralty says the channel leading out of the inner harbor has been completely blocked by the hulk of oJ the tile old cruiser Vindictive which was maneuvered into position under hea heavy vy fire and then sunk by bombs i It is pointed out that the obstruction obstruction obstruction tion in the channel at Ostend will t tend nl to eventually close the harbor through the action of the flip tides and the tho rapid I. I I sll silting 1 g guP uP up If Ostend and Zeebrugge are removed removed removed re re- moved as ports from which the German German German Ger- Ger Ger Ger- man U boats may be operated the be Germans ap apparently ar will rill be compelled ed to withdraw their submersibles to their home ports In this connection it is interesting to note that a week ago it was announced that the greatest greatest greatest great great- est mine mine field known known to naval operation operation operation opera opera- tion had been planted in the North sea to combat the submarines It was officially stated that the area of this mine field would be square miles and that it would be completed by May 15 Some months ago Admiral of the British navy announced that the he submarine menace would be met by August 1 and it is possible that he had tl the e blocking of the harbors of and in the laying of l an Immense mine field in mind when he made his bis statement |