On the Eastern Front, the Russian military situation continues to deteriorate. German troops have already taken Riga; now they land on Saaremaal in the Estonian archipeligo, crushing Russian resistance there. This is an ominous development: the amphibious operation is outflanking Russian defensive lines, threatening a German advance on Petrograd itself. To those in the capital who fear that the revolution has gone too far, the prospect of the Kaiser’s troops arrival becomes almost something to hope for.
Riga & the Baltic Islands (Wikipedia: Operation Albion)