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British advance on southern wing of new front east of Messines-Wytschaete Ridge; trench system near La Potterie Farm captured on a mile front, and progress made towards Warneton. Two German seaplanes brought down in the Channel by a British drifter which attacked a squadron of five. Text of British reply to Russian Note of May 3 issued; agreements between Allies believed, broadly speaking, conformable with principles laid down by Russian Government, but if so desired treaties can be re-examined and, if need be, revised. M. Jonnart, Allied Plenipotentiary in Greece, demands abdication of King Constantine.