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It's extremely difficult to make a frontal assault on the Daugava River. Although the German army to the south of the river isn't large, the attacking forces will inevitably suffer more casualties than the defenders.
Australasia has more options and naturally wouldn't waste limited manpower in such a place.
Currently, there are two ways to bypass the Daugava River defense line. One way is to adopt airdrop tactics, attacking areas such as Kaunas and Morojachino in Lithuania and German-controlled Vilnius from behind, severing the German army's retreat route.
However, this demands a lot from paratroopers, as they must penetrate deep into enemy territory and may also face encirclement by German forces from the directions of Minsk and Białystok.
But the advantages are also clear. Whether it's capturing Kaunas, Vilnius, or Morojachino, it would cut off the Germans' retreat routes and cause their painstakingly established Daugava River defense line to collapse instantly.